Physics EOC Prep Quiz 3/4
This is the 3rd of 4 prep quizzes reviewing concepts from physics A and B.
Questions and Answers
- 1.
All except one of the following require the application of a net force. Which ones the expection?
- A.
To change an object from a state of rest to a state of motion
- B.
To maintain an object in motion at a constant velocity
- C.
To change an objects speed w/out changing its direction of motion
- D.
To maintain an object in uniform circular motion
- E.
To accelerate an object
Correct Answer
B. To maintain an object in motion at a constant velocityExplanation
To maintain an object in motion at a constant velocity does not require the application of a net force. According to Newton's first law of motion, an object will continue to move at a constant velocity unless acted upon by an external force. In this case, if the object is already moving at a constant velocity, there is no need for a net force to be applied.Rate this question:
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- 2.
A ball is thrown up at 15 m/s, whats the velocity after 3.0 seconds?
- A.
14 m/s up
- B.
14 m/s down
- C.
44 m/s up
- D.
44 m/s down
- E.
None
Correct Answer
B. 14 m/s downExplanation
When the ball is thrown up, it experiences a constant acceleration due to gravity pulling it downwards. After 3.0 seconds, the ball will have reached its highest point and started to fall back down. At this point, its velocity will be equal to the initial velocity (15 m/s) minus the acceleration due to gravity (9.8 m/s^2) multiplied by the time (3.0 seconds). Therefore, the velocity after 3.0 seconds will be 15 m/s - (9.8 m/s^2 * 3.0 s) = 15 m/s - 29.4 m/s = -14.4 m/s. Since the velocity is negative, it indicates that the ball is moving downwards, hence the answer is 14 m/s down.Rate this question:
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- 3.
What is the magnitude of the accleration produced by a net force of 4500 N acting on a 900 kg automobile?
- A.
.20 m/s^2
- B.
3.8 m/s^2
- C.
5.0 m/s^2
- D.
9.8 m/s^2
- E.
None
Correct Answer
C. 5.0 m/s^2Explanation
The magnitude of the acceleration produced by a net force can be calculated using Newton's second law, which states that force is equal to mass multiplied by acceleration (F = m*a). In this case, the net force is given as 4500 N and the mass of the automobile is given as 900 kg. By rearranging the equation, we can solve for acceleration: a = F/m. Plugging in the values, we get a = 4500 N / 900 kg = 5.0 m/s^2. Therefore, the correct answer is 5.0 m/s^2.Rate this question:
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- 4.
A book weighing 10 N is held at rest in the palm of the hand. The reaction to the force of the hand on the book is a force of
- A.
10 N exerted by the Earth on the book
- B.
10 N exerted by the book on the Earth
- C.
10 N exerted by the book on the hand
- D.
0 N
- E.
9/8 m/s^2 in the downward direction arising from the force of the eart
Correct Answer
C. 10 N exerted by the book on the handExplanation
When the book is held at rest in the palm of the hand, the reaction to the force of the hand on the book is a force of 10 N exerted by the book on the hand. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. So, the force exerted by the book on the hand is equal in magnitude and opposite in direction to the force exerted by the hand on the book.Rate this question:
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- 5.
A ball is projected upward with an initial velocity of 5 m/s. It will reach its maximum height in approximately
- A.
0.5 s
- B.
1.0 s
- C.
49 s
- D.
2.0 s
- E.
0.0 s
Correct Answer
A. 0.5 sExplanation
When a ball is projected upward, it will reach its maximum height when its velocity becomes zero. This occurs at the highest point of its trajectory. The time it takes for the ball to reach this point is determined by the initial velocity and the acceleration due to gravity. In this case, the initial velocity is 5 m/s, and since the ball is projected upward, the acceleration due to gravity acts against it. Therefore, it will take less time for the ball to reach its maximum height compared to if it was projected downward. The correct answer of 0.5 s indicates the approximate time it takes for the ball to reach its maximum height.Rate this question:
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- 6.
The nucleus of an atom is made of
- A.
Protons
- B.
Neutrons
- C.
Electrons
- D.
Protons & electrons
- E.
Protons & neutrons
Correct Answer
E. Protons & neutronsExplanation
The nucleus of an atom is made of protons and neutrons. Protons have a positive charge, while neutrons have no charge. Electrons, on the other hand, are found in the electron cloud surrounding the nucleus. Therefore, the correct answer is protons and neutrons, as they are the particles that make up the nucleus of an atom.Rate this question:
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- 7.
Temperature can be described as
- A.
Heat
- B.
A measure of the average kinetic energy of the molecules of a substance
- C.
A fluid that flows between a hot and cold object
- D.
A physical quantity measured in calories
- E.
Energy transfer as a result of a temperature difference
Correct Answer
B. A measure of the average kinetic energy of the molecules of a substanceExplanation
Temperature can be described as a measure of the average kinetic energy of the molecules of a substance. This means that temperature is a measure of how fast the molecules in a substance are moving. When the molecules have higher kinetic energy, the temperature is higher, and when the molecules have lower kinetic energy, the temperature is lower. This definition helps us understand the concept of temperature and how it relates to the motion of molecules in a substance.Rate this question:
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- 8.
Which of the waves below is not a transverse wave?
- A.
A sound wave
- B.
A water wave
- C.
An electromagnetic wave
- D.
A plucked standing wave on a string
- E.
Light
Correct Answer
A. A sound waveExplanation
A sound wave is not a transverse wave because it is a longitudinal wave. In a transverse wave, the particles of the medium vibrate perpendicular to the direction of wave propagation. However, in a sound wave, the particles vibrate parallel to the direction of wave propagation. This means that the disturbance in a sound wave travels in a compressional and rarefactional pattern, rather than in an up-and-down motion like in a transverse wave.Rate this question:
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- 9.
If the distance between two spherical charged objects is decreased by a factor of two, then the electrical force between the objects
- A.
Decreases by a factor of 4
- B.
Is half as big
- C.
Doubles
- D.
Increases by a factor of 4
- E.
None
Correct Answer
D. Increases by a factor of 4Explanation
When the distance between two spherical charged objects is decreased by a factor of two, the electrical force between them increases. This is because the electrical force is inversely proportional to the square of the distance between the objects. When the distance is halved, the denominator of the equation becomes one-fourth of its original value, resulting in a fourfold increase in the force. Therefore, the electrical force between the objects increases by a factor of 4.Rate this question:
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- 10.
A current of 2.5 A is flowing through a resistance of 18 Ohms. hat is the voltage difference across this resistance?
- A.
1.5 V
- B.
6 V
- C.
45 V
- D.
115 V
- E.
None
Correct Answer
C. 45 VExplanation
The voltage difference across a resistance can be calculated using Ohm's Law, which states that voltage (V) is equal to the current (I) multiplied by the resistance (R). In this case, the current is given as 2.5 A and the resistance is 18 Ohms. Therefore, the voltage difference across this resistance can be calculated as 2.5 A * 18 Ohms = 45 V.Rate this question:
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- 11.
Which one of the following parts of the electromagnetic spectrum has the lowest frequency of oscillation?
- A.
Infrared rays
- B.
Ultraviolet rays
- C.
Visible rays
- D.
Gamma rays
- E.
X rays
Correct Answer
A. Infrared raysExplanation
Infrared rays have the lowest frequency of oscillation among the given options. The electromagnetic spectrum consists of various types of waves, each with a different frequency and wavelength. Infrared rays have longer wavelengths and lower frequencies compared to ultraviolet rays, visible rays, gamma rays, and x rays. This means that they have a slower rate of oscillation and are less energetic. Infrared rays are commonly associated with heat and are used in thermal imaging and communication technologies.Rate this question:
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- 12.
What wave property distinguishes between different colors?
- A.
Intensity
- B.
Velocity
- C.
Polarization
- D.
Amplitude
- E.
Frequency
Correct Answer
E. FrequencyExplanation
Frequency is the wave property that distinguishes between different colors. Frequency refers to the number of complete cycles of a wave that occur in a given time period. In the context of light, different colors have different frequencies. For example, red light has a lower frequency than blue light. Therefore, by measuring the frequency of a wave, we can determine the color of light.Rate this question:
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- 13.
A massive bowling ball hangs from the rafters by a string. An identical string is tied to the bottom of the ball. A bowler quickly jerks downward on the lower string. Which string breaks and why?
- A.
The upper string breaks because of the inertial force of the ball.
- B.
The lower string breaks because of the inertia of the ball.
- C.
The upper string breaks because the weight of the ball combines with the pulling force.
- D.
The lower string breaks because the upper string pulls up on the ball.
Correct Answer
B. The lower string breaks because of the inertia of the ball.Explanation
The lower string breaks because of the inertia of the ball. When the bowler jerks downward on the lower string, the ball resists the change in its state of motion due to its inertia. This causes a sudden downward force on the lower string, which can exceed its breaking point and cause it to break. The upper string, on the other hand, does not experience the same sudden force and therefore does not break.Rate this question:
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- 14.
A high school student holds a backpack one meter above the ground.
- A.
F
- B.
G
- C.
H
- D.
J
Correct Answer
D. J -
- 15.
If the drag force is greater than the applied force, which of the following describes the motion of the automobile?
- A.
Slowing down
- B.
Rotating
- C.
Speeding Up
- D.
Moving at constant speed
Correct Answer
A. Slowing downExplanation
If the drag force is greater than the applied force, it means that the resistance to motion caused by the drag force is stronger than the force pushing the automobile forward. As a result, the automobile will experience a deceleration and slow down.Rate this question:
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- 16.
Which one of the following quantities is NOT a vector?
- A.
Distance
- B.
Velocity
- C.
Displacement
- D.
Acceleration
Correct Answer
A. DistanceExplanation
Distance is not a vector because it only represents the magnitude or size of the displacement between two points. It does not have a specific direction associated with it. On the other hand, velocity, displacement, and acceleration are all vector quantities because they have both magnitude and direction.Rate this question:
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- 17.
Earth’s gravity is acting on the diver. Which statement best describes the reaction force to Earth’s gravity in this situation?
- A.
The diver is pulling on Earth with a force of 911 N.
- B.
The sun is pulling on Earth with a force of 5.97 ×1024 N.
- C.
Earth is pulling on the water with a force of 5.97 ×1025 N.
- D.
Earth is pulling on the air with a force of 2.28 ×104 N.
Correct Answer
A. The diver is pulling on Earth with a force of 911 N.Explanation
The reaction force to Earth's gravity in this situation is the Earth pulling on the diver with a force of 911 N.Rate this question:
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- 18.
A baseball was thrown with an initial velocity of 14 m/s at an angle above the horizontal. It remained in the air for 2 s. Which of the following quantities was constant while the baseball was in the air?
- A.
Acceleration
- B.
Displacement
- C.
Position
- D.
Velocity
Correct Answer
A. AccelerationExplanation
While the baseball is in the air, the only force acting on it is gravity, which causes a constant acceleration downwards. Since acceleration is the rate of change of velocity, and velocity is constantly changing due to the acceleration of gravity, the correct answer is acceleration. The displacement, position, and velocity of the baseball will all change over time while it is in the air.Rate this question:
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- 19.
A 5.0 kg ball is moving in a 5.0 m horizontal circle every 3.0 s. The ball experiences _____________.
- A.
No net force
- B.
Centripetal Acceleration
- C.
Only the acceleration of gravity
- D.
Motion due only to its inertia
Correct Answer
B. Centripetal AccelerationExplanation
The correct answer is centripetal acceleration. This is because in order for the ball to move in a horizontal circle, there must be a force acting towards the center of the circle, which is known as the centripetal force. According to Newton's second law of motion, when there is a net force acting on an object, it will experience acceleration. In this case, the centripetal acceleration is responsible for keeping the ball moving in its circular path. The other options are not correct because they do not explain the specific force or acceleration acting on the ball in this scenario.Rate this question:
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- 20.
A bus is moving forward at 20 m/s. A student on the bus throws a tennis ball horizontally at 15 m/s toward the front of the bus. From the perspective of an observer on the sidewalk outside the bus, the tennis ball appears to move at —
- A.
5 m/s
- B.
15 m/s
- C.
20 m/s
- D.
35 m/s
Correct Answer
D. 35 m/s -
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Current Version
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Mar 19, 2023Quiz Edited by
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Feb 18, 2014Quiz Created by
Kevin L.
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