Science "A Closer Look" Chapter 11 Quiz
This is a quiz over Chapter 11 from Macmillan/McGraw-Hill Science A Closer Look
Questions and Answers
- 1.
An object is in motion if it's location is?
- A.
Standing still
- B.
Constantly changing
Correct Answer
B. Constantly changingExplanation
An object is considered to be in motion if its location is constantly changing. This means that the object is not stationary or standing still, but rather moving from one position to another. Therefore, the correct answer is "constantly changing."Rate this question:
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- 2.
A change in distance over time?
- A.
Red Light
- B.
Speed
- C.
Stop
Correct Answer
B. SpeedExplanation
The correct answer is "Speed" because speed is defined as the change in distance over time. It represents how fast an object is moving or the rate at which it covers a certain distance. In this context, "Red Light" and "Stop" do not relate to a change in distance over time, whereas "Speed" directly corresponds to the given explanation.Rate this question:
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- 3.
What is the formula for calculating speed?
- A.
Speed=distance/time
- B.
Speed=velocity/time
- C.
Speed=acceleration/distance
Correct Answer
A. Speed=distance/timeExplanation
The formula for calculating speed is speed = distance/time. This formula represents the concept that speed is equal to the distance traveled divided by the time taken to travel that distance. By dividing the distance by the time, we can determine how fast an object is moving. This formula is commonly used in physics and everyday life to measure the rate at which something is moving.Rate this question:
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- 4.
A change in speed or direction of a moving object?
- A.
Speed
- B.
Distance
- C.
Acceleration
Correct Answer
C. AccelerationExplanation
Acceleration refers to a change in speed or direction of a moving object. It is a measure of how quickly the velocity of an object changes over time. When an object speeds up, slows down, or changes direction, it is experiencing acceleration. Therefore, acceleration is the correct answer because it directly relates to the given question.Rate this question:
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- 5.
The size of the force acting on an object affects?
- A.
Acceleration
- B.
Velocity
- C.
Inertia
Correct Answer
A. AccelerationExplanation
The size of the force acting on an object affects its acceleration. Acceleration is the rate at which an object changes its velocity over time. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. Therefore, a larger force will result in a greater acceleration, while a smaller force will result in a smaller acceleration. The size of the force does not directly affect an object's velocity or inertia.Rate this question:
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- 6.
What describes speed and direction of movement?
- A.
Velocity
- B.
Acceleration
- C.
Distance
Correct Answer
A. VelocityExplanation
Velocity is the correct answer because it is a vector quantity that describes both the speed and direction of movement. Speed only indicates how fast an object is moving, whereas velocity includes the direction as well. Acceleration refers to the rate at which an object's velocity changes, and distance is a scalar quantity that measures the length of the path traveled.Rate this question:
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- 7.
The tendency of an object in motion to stay in motion and an object at rest to stay at rest?
- A.
Balanced forces
- B.
Inertia
- C.
Energy
Correct Answer
B. InertiaExplanation
Inertia is the correct answer because it refers to the tendency of an object in motion to continue moving and an object at rest to remain stationary unless acted upon by an external force. This concept is based on Newton's first law of motion, which states that an object will maintain its state of motion unless acted upon by an external force. Inertia is a fundamental property of matter and is related to the mass of an object.Rate this question:
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- 8.
What if the force that pulls on us constrantly, trying to pull us and everything on earth to the center of Earth?
- A.
Gravity
- B.
Inertia
- C.
Velocity
Correct Answer
A. GravityExplanation
Gravity is the force that pulls objects towards the center of the Earth. It is a fundamental force of nature that exists between any two objects with mass. Gravity is responsible for keeping us grounded on the Earth's surface and for the motion of celestial bodies in the universe. In this context, gravity is the force that constantly pulls on us and everything on Earth, trying to bring us towards the center of the Earth.Rate this question:
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- 9.
The pull of gravity depends on how many things?
- A.
One
- B.
Two
- C.
Three
Correct Answer
B. TwoExplanation
The pull of gravity depends on two things: the mass of the object and the distance between the object and another massive object. The greater the mass of an object, the stronger its gravitational pull. Similarly, the closer two objects are to each other, the stronger the gravitational force between them. Therefore, the correct answer is two because both mass and distance are factors that determine the strength of gravity.Rate this question:
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- 10.
One thing the pull of gravity depends on
- A.
Positive or negative charges in an object
- B.
The atomic number of matter
- C.
The amount of matter in an object
Correct Answer
C. The amount of matter in an objectExplanation
The pull of gravity depends on the amount of matter in an object because gravity is a force of attraction between two objects that is directly proportional to their masses. The more matter an object has, the greater its mass, and therefore the stronger the gravitational pull it exerts. Objects with larger masses have a stronger gravitational force and are more likely to attract other objects towards them.Rate this question:
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- 11.
What is the second thing the pull of gravity depends on
- A.
The distance between two objects
- B.
The velocity to the next object
- C.
Balanced forces to unbalanced forces
Correct Answer
A. The distance between two objectsExplanation
The pull of gravity is determined by the distance between two objects. The greater the distance between two objects, the weaker the gravitational force between them. This is explained by the inverse square law, which states that the force of gravity decreases as the distance between objects increases. Therefore, the second thing that the pull of gravity depends on is the distance between two objects.Rate this question:
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- 12.
Balanced forces are _________ and cancel each other out.
- A.
Unequal
- B.
Equal
- C.
Constant
Correct Answer
B. EqualExplanation
Balanced forces are equal in magnitude and opposite in direction. When two or more forces acting on an object are balanced, their combined effect is a net force of zero. This means that the forces cancel each other out, resulting in no change in the object's motion. Therefore, the correct answer is "equal."Rate this question:
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- 13.
Balanced forces cause motion
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Balanced forces do not cause motion. In fact, balanced forces result in no motion or a state of equilibrium. When the forces acting on an object are balanced, the net force is zero, and the object remains at rest or continues moving at a constant velocity. Motion occurs when unbalanced forces are applied to an object, causing a change in its velocity or direction. Therefore, the statement "Balanced forces cause motion" is false.Rate this question:
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- 14.
Unbalanced forces are __________ and do not cancel eachother out.
- A.
Equal
- B.
Not equal
- C.
Constant
Correct Answer
B. Not equalExplanation
Unbalanced forces refer to forces that are not equal in magnitude and/or direction. These forces do not cancel each other out, meaning that there is a net force acting on an object. This net force causes the object to accelerate in the direction of the larger force. Therefore, the correct answer is "not equal."Rate this question:
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- 15.
Unbalanced forces cause motion.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Unbalanced forces cause motion because when the forces acting on an object are not equal in magnitude and opposite in direction, there is a net force that results in acceleration. This acceleration causes the object to move in the direction of the greater force. Therefore, if the forces acting on an object are unbalanced, it will experience motion.Rate this question:
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- 16.
When you lift weights above your head it is considered work.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When you lift weights above your head, you are exerting force against gravity to move the weights upwards. This requires energy and is considered as work according to the scientific definition of work, which is the transfer of energy that occurs when a force is applied to an object and it is displaced in the direction of the force. Therefore, the statement is true.Rate this question:
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- 17.
Holding weights still above your head is not considered work
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Holding weights still above your head is not considered work because work is defined as the transfer of energy that occurs when a force is applied to an object and it causes the object to move. In this case, if the weights are held still above your head, no movement is occurring, so no work is being done.Rate this question:
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- 18.
Energy is the ability to do work.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Energy is defined as the capacity or ability to do work. It is the ability of a system or object to exert force and cause a change in its surroundings. Work, on the other hand, is the transfer of energy from one object to another, resulting in a displacement of the object. Therefore, energy and work are closely related concepts, and energy being the ability to do work is a correct statement.Rate this question:
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- 19.
Energy in motion is called Potential energy.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The given statement is incorrect. Energy in motion is actually called Kinetic energy, not Potential energy. Potential energy refers to the energy that an object possesses due to its position or condition, such as gravitational potential energy or elastic potential energy. Kinetic energy, on the other hand, refers to the energy possessed by an object due to its motion.Rate this question:
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- 20.
Energy in motion is called Kinetic energy.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Kinetic energy is the energy possessed by an object due to its motion. When an object is in motion, it has the ability to do work or cause a change in its surroundings. This energy is known as kinetic energy. Therefore, the given statement that "Energy in motion is called kinetic energy" is true.Rate this question:
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- 21.
Energy is isn't created or destroyed, it changes forms.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is based on the law of conservation of energy, which states that energy cannot be created or destroyed, only transformed from one form to another. This means that the total amount of energy in a closed system remains constant. Therefore, the statement is true, as energy can change forms but it cannot be created or destroyed.Rate this question:
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- 22.
Give me the five forms of energy
Correct Answer
mechanical electrical light thermal chemical
chemical mechanical electrical light thermal
electrical chemical mechanical thermal light
light electrical thermal chemical mechanical
thermal electrical light mechanical chemicalExplanation
The five forms of energy are mechanical, electrical, light, thermal, and chemical. Mechanical energy refers to the energy possessed by an object due to its motion or position. Electrical energy is the energy carried by electric charges, typically in the form of electric current. Light energy is the energy carried by electromagnetic waves, which allows us to see and perceive the world around us. Thermal energy is the energy associated with the motion of particles in a substance, which determines its temperature. Chemical energy is the energy stored in the bonds between atoms and molecules, which is released or absorbed during chemical reactions.Rate this question:
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