Preap Physics Final Exam

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Preap Physics Final Exam - Quiz

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Questions and Answers
  • 1. 

    Which of the following situations represents a positive displacement of a carton? Assume positive position is measured vertically upward along a y-axis.

    • A.

      A. A delivery person waiting for an elevator lowers a carton onto a dolly.

    • B.

      B. When the elevator doors open, the delivery person lifts the dolly over the threshold of the elevator.

    • C.

      C. The delivery person pushes the dolly to the back of the elevator while pressing a floor button.

    • D.

      D. The door closes and the elevator moves from the 10th to the 4th floors.

    Correct Answer
    B. B. When the elevator doors open, the delivery person lifts the dolly over the threshold of the elevator.
    Explanation
    In this situation, the delivery person is lifting the carton vertically upward, which represents a positive displacement along the y-axis. The other options do not involve a vertical upward displacement of the carton.

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  • 2. 

    During which interval is the cat at rest?

    • A.

      a. 0.05.0 s

    • B.

      b. 5.010.0 s

    • C.

      C. 10.015.0s

    • D.

      D. 15.020.0 s

    Correct Answer
    B. b. 5.010.0 s
  • 3. 

    While a car travels around a circular track at constant speed, its

    • A.

      A. acceleration is zero

    • B.

      B. velocity is zero

    • C.

      Both acceleration and velocity are zero.

    • D.

      D. none of these choices

    Correct Answer
    C. Both acceleration and velocity are zero.
    Explanation
    When a car travels around a circular track at a constant speed, its velocity is zero because the car is constantly changing direction but not changing speed. Acceleration is also zero because acceleration is the rate of change of velocity, and since the car is not changing its speed or direction, there is no acceleration. Therefore, both acceleration and velocity are zero in this scenario.

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  • 4. 

    What does the graph on the right illustrate about acceleration?

    • A.

      a. The acceleration varies.

    • B.

      b. The acceleration is zero.

    • C.

      c. The acceleration is constant.

    • D.

      d. The acceleration increases then becomes constant.

    Correct Answer
    A. a. The acceleration varies.
    Explanation
    The graph on the right illustrates that the acceleration is not constant, as it is shown to change over time. The graph shows different values of acceleration at different points, indicating that the acceleration varies.

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  • 5. 

    A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?

    • A.

      a. midway on the way up

    • B.

      b. at the top of its path

    • C.

      c. the instant it leaves the catcher’s hand

    • D.

      d. the instant before it arrives in the catcher’s mitt

    Correct Answer
    B. b. at the top of its path
    Explanation
    At the top of its path, the ball experiences zero velocity because it momentarily stops moving before it starts to fall back down. At the same time, it experiences non-zero acceleration due to the force of gravity pulling it downwards. This acceleration is responsible for changing the ball's velocity from zero to a non-zero value as it starts to fall.

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  • 6. 

    Which of the following is a physical quantity that has both magnitude and direction?

    • A.

      A. Vector

    • B.

      B. Scalar

    • C.

      C. Resultant

    • D.

      D. frame of reference

    Correct Answer
    A. A. Vector
    Explanation
    A vector is a physical quantity that has both magnitude and direction. Magnitude refers to the size or quantity of the vector, while direction indicates the orientation or the way it is pointed. Vectors are commonly used to represent various physical quantities such as displacement, velocity, force, and acceleration. They are represented by an arrow, where the length of the arrow represents the magnitude and the direction of the arrow represents the direction of the vector. Scalars, on the other hand, only have magnitude and do not have a specific direction associated with them. Resultant refers to the sum or combination of multiple vectors. A frame of reference is a coordinate system used to describe the position and motion of objects.

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  • 7. 

    In the figure below, which diagram represents the vector addition,C = A + B?

    • A.

      A. I

    • B.

      B. II

    • C.

      C. III

    • D.

      D. IV

    Correct Answer
    B. B. II
    Explanation
    In vector addition, the resultant vector is obtained by placing the tail of the second vector at the head of the first vector. Looking at diagram II, we can see that the tail of vector B is placed at the head of vector A, which is the correct representation of vector addition. Therefore, diagram II represents the vector addition C = A + B.

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  • 8. 

    The components of a vector are

    • A.

      A. each equal to half the magnitude of the vector.

    • B.

      B. independent of the orientation of the vector.

    • C.

      C. perpendicular.

    • D.

      D. vector quantities.

    Correct Answer
    C. C. perpendicular.
    Explanation
    The components of a vector are perpendicular to each other. This means that they are at right angles to each other and do not depend on the orientation of the vector. The magnitude of the vector is not necessarily equal to half the magnitude of each component, and while vectors are indeed vector quantities, this is not the specific characteristic being described here. Therefore, the correct answer is c. perpendicular.

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  • 9. 

    The motion of a projectile in free fall is characterized by

    • A.

      A. ax = ay = -g.

    • B.

      B. ax = constant and vy = constant.

    • C.

      C. vx = constant and ay = -g.

    • D.

      D. vx = constant and vy = constant.

    Correct Answer
    C. C. vx = constant and ay = -g.
    Explanation
    The motion of a projectile in free fall is characterized by a constant horizontal velocity (vx = constant) because there is no horizontal acceleration. The vertical acceleration is always equal to the acceleration due to gravity (ay = -g) because the only force acting on the projectile in the vertical direction is gravity. The vertical velocity (vy) changes over time due to the acceleration, so it is not constant. Therefore, option c is the correct answer.

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  • 10. 

    The net force acting on an object is zero.  Based on this information, which statement about the object is FALSE?

    • A.

      A. The velocity must be zero.

    • B.

      B. The velocity must be constant.

    • C.

      C. The acceleration must be zero.

    • D.

      D. The momentum must be constant

    Correct Answer
    B. B. The velocity must be constant.
    Explanation
    If the net force acting on an object is zero, it means that the object is in equilibrium. In this case, the object may have a non-zero velocity, but it does not have to be constant. The object could be moving at a constant velocity, but it could also be at rest or moving with a changing velocity. Therefore, statement b is false.

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  • 11. 

    In the free-body diagram shown to the right, which of the following is the gravitational force acting on the car?

    • A.

      A. 5800 N

    • B.

      B. 14 700 N

    • C.

      C. 775 N

    • D.

      D. 13 690 N

    Correct Answer
    B. B. 14 700 N
  • 12. 

    If a nonzero net force is acting on an object, then the object is definitely

    • A.

      A. at rest

    • B.

      B. being accelerated.

    • C.

      C. moving with a constant velocity

    • D.

      D. losing mass.

    Correct Answer
    B. B. being accelerated.
    Explanation
    If a nonzero net force is acting on an object, it means that there is an unbalanced force acting on the object. According to Newton's second law of motion, an unbalanced force will cause an object to accelerate. Therefore, the correct answer is b. being accelerated.

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  • 13. 

    In which situation is the net force acting on a car zero?

    • A.

      A. The car increases speed and changes direction.

    • B.

      B. The car increases speed but does not change direction.

    • C.

      C. The car maintains its speed but changes direction.

    • D.

      D. The car maintains both its speed and direction.

    Correct Answer
    D. D. The car maintains both its speed and direction.
    Explanation
    When the net force acting on a car is zero, it means that the forces acting in opposite directions cancel each other out, resulting in no overall force. In this situation, the car maintains both its speed and direction because there is no external force acting on it to change either of these factors.

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  • 14. 

    A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation.

    • A.

      A. The nail exerts a force on the hammer; the hammer exerts a force on the wood.

    • B.

      B. The hammer exerts a force on the nail; the wood exerts a force on the nail.

    • C.

      C. The hammer exerts a force on the nail; the nail exerts a force on the hammer.

    • D.

      D. The hammer exerts a force on the nail; the hammer exerts a force on the wood.

    Correct Answer
    C. C. The hammer exerts a force on the nail; the nail exerts a force on the hammer.
    Explanation
    When a hammer drives a nail into a piece of wood, the action-reaction pair is that the hammer exerts a force on the nail, and in return, the nail exerts an equal and opposite force on the hammer. This is in accordance with Newton's third law of motion, which states that for every action, there is an equal and opposite reaction.

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  • 15. 

    Work is done on an object

    • A.

      A. whenever a force acts on the object.

    • B.

      B. whenever a force is perpendicular to the displacement of the object.

    • C.

      C. whenever a force causes a displacement of the object.

    • D.

      D. whenever a net force acts on the object.

    Correct Answer
    C. C. whenever a force causes a displacement of the object.
    Explanation
    Work is defined as the transfer of energy that occurs when a force is applied to an object and causes it to move in the direction of the force. In order for work to be done, there must be a displacement of the object caused by the force. Therefore, option c is the correct answer as it states that work is done whenever a force causes a displacement of the object. Options a, b, and d are not necessarily true as work can be done even if the force is not perpendicular to the displacement, or if there are multiple forces acting on the object.

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  • 16. 

    The main difference between kinetic energy and potential energy is that

    • A.

      A. kinetic energy involves position, and potential energy involves motion.

    • B.

      B. kinetic energy involves motion, and potential energy involves position.

    • C.

      C. although both energies involve motion, only kinetic energy involves position.

    • D.

      D. although both energies involve position, only potential energy involves motion.

    Correct Answer
    B. B. kinetic energy involves motion, and potential energy involves position.
    Explanation
    The correct answer is b. Kinetic energy involves motion, and potential energy involves position. This is because kinetic energy is the energy of an object due to its motion, while potential energy is the energy that an object possesses due to its position or condition. Kinetic energy is dependent on the mass and velocity of an object, while potential energy is dependent on factors such as height, position, and elasticity. Therefore, the main difference between the two is that kinetic energy is associated with motion, while potential energy is associated with position.

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  • 17. 

    The mechanical energy of a system of objects is

    • A.

      A. the sum of kinetic energy and gravitational potential energy.

    • B.

      B. the sum of kinetic energy and elastic potential energy.

    • C.

      C. the sum of kinetic energy and all relevant forms of potential energy.

    • D.

      D. the sum of all forms of energy.

    Correct Answer
    C. C. the sum of kinetic energy and all relevant forms of potential energy.
    Explanation
    The mechanical energy of a system of objects is the sum of kinetic energy and all relevant forms of potential energy. This means that it includes not only the energy associated with the motion of the objects (kinetic energy), but also the energy associated with their position or configuration (potential energy). This can include gravitational potential energy, elastic potential energy, and any other form of potential energy that is relevant to the system. By considering all forms of potential energy, the answer c encompasses a broader range of energy forms and provides a more comprehensive understanding of the mechanical energy of the system.

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  • 18. 

    When comparing the momentum of two moving objects, which of the following is correct?

    • A.

      A. The object with the higher velocity will have less momentum if the masses are equal.

    • B.

      B. The more massive object will have less momentum if its velocity is greater.

    • C.

      C. The less massive object will have less momentum if the velocities are the same.

    • D.

      D. The more massive object will have less momentum if the velocities are the same.

    Correct Answer
    C. C. The less massive object will have less momentum if the velocities are the same.
    Explanation
    Momentum is defined as the product of mass and velocity. Therefore, if the velocities are the same, the object with less mass will have less momentum. This is because momentum is directly proportional to mass.

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  • 19. 

    When two ice skaters initially at rest push off one another, their final momenta are

    • A.

      A. equal in magnitude and direction.

    • B.

      B. equal in magnitude and opposite in direction.

    • C.

      C. in the same direction but of different magnitudes

    • D.

      D. in opposite directions and possibly of different magnitudes.

    Correct Answer
    B. B. equal in magnitude and opposite in direction.
    Explanation
    When two ice skaters initially at rest push off one another, their final momenta are equal in magnitude and opposite in direction. This is because of the law of conservation of momentum, which states that the total momentum of an isolated system remains constant. Since the skaters are initially at rest, their total momentum is zero. When they push off each other, their momenta change, but the total momentum of the system must still be zero. Therefore, their final momenta must be equal in magnitude but in opposite directions to cancel out each other and maintain the total momentum of the system at zero.

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  • 20. 

    Two objects stick together and move with a common velocity after colliding. Identify the type of collision.

    • A.

      A. Elastic

    • B.

      B. Inelastic

    • C.

      C. Perfectly elastic

    • D.

      D. perfectly inelastic

    Correct Answer
    D. D. perfectly inelastic
    Explanation
    In a perfectly inelastic collision, two objects stick together and move with a common velocity after colliding. This means that they combine and become one object after the collision. In this type of collision, kinetic energy is not conserved, and some or all of the initial kinetic energy is converted into other forms of energy, such as heat or sound. Therefore, the correct answer is d. perfectly inelastic.

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  • 21. 

    In what kind of collision is kinetic energy always conserved?

    • A.

      A. elastic collision

    • B.

      B. inelastic collision

    • C.

      C. perfectly elastic collision

    • D.

      D. perfectly inelastic collision

    Correct Answer
    A. A. elastic collision
    Explanation
    In an elastic collision, kinetic energy is always conserved. This means that the total kinetic energy of the system before the collision is equal to the total kinetic energy after the collision. In an elastic collision, the objects involved bounce off each other without any loss of kinetic energy. This is in contrast to an inelastic collision, where some of the kinetic energy is lost and converted into other forms of energy such as heat or sound. A perfectly elastic collision is a special case of an elastic collision where there is no loss of kinetic energy at all. A perfectly inelastic collision, on the other hand, is a type of collision where the objects stick together and move as one after the collision, resulting in a loss of kinetic energy.

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  • 22. 

    What term describes a force that causes an object to move in a circular path?

    • A.

      A. circular force

    • B.

      b. centripetal acceleration

    • C.

      c. centripetal force

    • D.

      d. centrifugal force

    Correct Answer
    C. c. centripetal force
    Explanation
    Centripetal force is the correct answer because it is the force that acts towards the center of a circular path, causing an object to move in that path. This force is necessary to keep an object moving in a curved trajectory and prevents it from moving in a straight line. Centripetal force is always directed inward and is responsible for maintaining the object's circular motion.

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  • 23. 

    The law of universal gravitation states that 

    • A.

      A. two objects always exert gravitational forces on each other.

    • B.

      B. the force of gravity depends on the mass and the distance between the two objects.

    • C.

      C. all objects fall at different rates on earth.

    • D.

      D. both a and b.

    Correct Answer
    D. D. both a and b.
    Explanation
    The law of universal gravitation states that two objects always exert gravitational forces on each other. This means that any two objects in the universe will attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Therefore, option a is correct. Additionally, the force of gravity does depend on the mass and the distance between the two objects, as explained by the law of universal gravitation. Therefore, option b is also correct. Hence, the correct answer is d. both a and b.

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  • 24. 

    How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?

    • A.

      a. It would increase by a factor of 2.

    • B.

      b. It would increase by a factor of 4.

    • C.

      c. It would decrease by a factor of 2.

    • D.

      d. The speed would not change.

    Correct Answer
    C. c. It would decrease by a factor of 2.
    Explanation
    If Earth's distance from the sun increased by 4 times, the speed of Earth's orbit around the sun would decrease. This is because according to Kepler's laws of planetary motion, the speed of a planet in its orbit is inversely proportional to its distance from the sun. As the distance increases, the gravitational pull decreases, causing the planet to move slower. In this case, if the distance increases by a factor of 4, the speed would decrease by a factor of 2.

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  • 25. 

    Which of the following statements is correct?

    • A.

      A. The closer the force is to the axis of rotation, the less torque is produced.

    • B.

      B. The closer the force is to the axis of rotation, the easier it is to rotate the object.

    • C.

      C. The farther the force is from the axis of rotation, the harder it is to rotate the object.

    • D.

      D. The farther the force is from the axis of rotation, the less torque is produced.

    Correct Answer
    A. A. The closer the force is to the axis of rotation, the less torque is produced.
    Explanation
    The statement "The closer the force is to the axis of rotation, the less torque is produced" is correct because torque is the product of force and the perpendicular distance from the axis of rotation. When the force is closer to the axis of rotation, the perpendicular distance decreases, resulting in a smaller torque. This can be understood using the equation for torque, which is given by Torque = Force x Distance x sin(theta), where theta is the angle between the force vector and the direction of the lever arm. As the distance decreases, the torque decreases. Therefore, the statement is correct.

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  • 26. 

    Using a machine can allow you to

    • A.

      A. do less work to perform a given task.

    • B.

      B. use less force to do a given amount of work.

    • C.

      C. decrease both the input force and input distance required to do work.

    • D.

      D. increase both the input force and input distance required to do work.

    Correct Answer
    B. B. use less force to do a given amount of work.
    Explanation
    Using a machine allows you to use less force to do a given amount of work. Machines are designed to multiply or change the direction of the force applied, making it easier to perform tasks that would require more force if done manually. By using a machine, you can achieve the same amount of work with less effort, reducing the physical strain on the person performing the task.

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  • 27. 

    According to Hooke’s law, the force exerted by a spring on an object is proportional to

    • A.

      A. the mass of the object.

    • B.

      B. the displacement of the spring.

    • C.

      C. the length of the spring.

    • D.

      D. the volume of the object.

    Correct Answer
    B. B. the displacement of the spring.
    Explanation
    According to Hooke's law, the force exerted by a spring on an object is proportional to the displacement of the spring. This means that as the spring is stretched or compressed, the force it exerts on the object increases or decreases accordingly. The mass of the object, length of the spring, and volume of the object do not directly affect the force exerted by the spring, making option b the correct answer.

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  • 28. 

    A student rubs a certain rod with plastic wrap. The rod then repels a glass rod that has been rubbed with silk and attracts a rubber rod that has been rubbed with fur. This observation shows that the first rod has a(n) _______________ charge.

    • A.

      A. Positive

    • B.

      B. Negative

    • C.

      C. Neutral

    • D.

      D. Undetermined

    Correct Answer
    A. A. Positive
    Explanation
    The given observation indicates that the first rod repels the glass rod rubbed with silk, which is known to have a positive charge. This suggests that the first rod must also have a positive charge, as like charges repel each other. Additionally, the first rod attracts the rubber rod rubbed with fur, which is known to have a negative charge. This further supports the conclusion that the first rod has a positive charge, as opposite charges attract each other. Therefore, the correct answer is a. Positive.

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  • 29. 

    Electric force and gravitational force are alike in that both forces

    • A.

      A. depend on charge.

    • B.

      B. act only when objects are touching.

    • C.

      C. depend on mass.

    • D.

      D. are field forces.

    Correct Answer
    D. D. are field forces.
    Explanation
    Electric force and gravitational force are alike in that both forces are field forces. This means that they can act on objects even when they are not in direct contact with each other. Both forces can act over a distance, with the electric force acting between charged particles and the gravitational force acting between objects with mass. These forces create fields in their respective domains, which allow them to exert their influence on other objects without direct contact.

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  • 30. 

    A mass attached to a spring vibrates back and forth. At the equilibrium position, the

    • A.

      A. acceleration reaches a maximum.

    • B.

      B. velocity reaches a maximum.

    • C.

      C. net force reaches a maximum.

    • D.

      D. velocity reaches zero.

    Correct Answer
    B. B. velocity reaches a maximum.
    Explanation
    When the mass attached to a spring is at the equilibrium position, it has the maximum potential energy and the minimum kinetic energy. As the mass starts moving away from the equilibrium position, the potential energy decreases and the kinetic energy increases. This means that the velocity of the mass increases until it reaches a maximum when it is furthest from the equilibrium position. Therefore, option b is correct.

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  • 31. 

    The distance between two compressions of a longitudinal wave is the wave’s

    • A.

      A. amplitude.

    • B.

      B. wavelength.

    • C.

      C. frequency.

    • D.

      D. trough.

    Correct Answer
    B. B. wavelength.
    Explanation
    The distance between two compressions of a longitudinal wave is referred to as the wavelength. In a longitudinal wave, the particles of the medium vibrate back and forth in the same direction as the wave is traveling. The compressions are the regions where the particles are closest together, and the wavelength is the distance between two consecutive compressions. The amplitude refers to the maximum displacement of the particles from their equilibrium position, the frequency is the number of complete cycles of the wave that occur in one second, and the trough is the region where the particles are farthest apart.

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  • 32. 

    Consider two identical wave pulses on a rope having a fixed end. Suppose the first pulse reaches the end of the rope, is reflected back, and then meets the second pulse. When the two pulses overlap exactly, what will be the amplitude of the resultant pulse?

    • A.

      a. zero

    • B.

      b. same as the original pulses

    • C.

      c. double the amplitude of the original pulses

    • D.

      d. half the amplitude of the original pulses

    Correct Answer
    A. a. zero
    Explanation
    When the two pulses overlap exactly, they will interfere with each other. If the first pulse is reflected back and meets the second pulse exactly, they will have opposite displacements at every point. This means that the positive displacement of one pulse will be canceled out by the negative displacement of the other pulse, resulting in a net displacement of zero. Therefore, the amplitude of the resultant pulse will be zero.

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  • 33. 

    Which of the following is the region of a sound wave in which the density and pressure are greater than normal?

    • A.

      A. rarefaction

    • B.

      B. amplitude

    • C.

      C. compression

    • D.

      D. wavelength

    Correct Answer
    C. C. compression
    Explanation
    The region of a sound wave in which the density and pressure are greater than normal is called compression. Compression occurs when the particles in the medium are pushed closer together, resulting in an increase in density and pressure. This is in contrast to rarefaction, which is the region of a sound wave where the density and pressure are lower than normal. The amplitude of a sound wave refers to the maximum displacement of particles from their equilibrium position, while wavelength is the distance between two consecutive points in a wave.

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  • 34. 

    Which of the following statements about magnetic field lines is not true?

    • A.

      A. Magnetic field lines have no beginning or end.

    • B.

      B. Magnetic field lines form open or closed loops.

    • C.

      C. Magnetic field lines appear to begin at the north pole of a magnet.

    • D.

      D. Magnetic field lines appear to end at the south pole of a magnet.

    Correct Answer
    B. B. Magnetic field lines form open or closed loops.
    Explanation
    Magnetic field lines do form closed loops. They start from the north pole of a magnet, curve around the magnet, and end at the south pole. This is known as the magnetic field line pattern. Therefore, option b is not true.

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