# Physics Midterm

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1. Units that measure weight are units of:

A.  acceleration
B.  mass
C.  velocity
D.  force
D. force
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2. A force unit is defined as the product of a mass unit and a unit of:

A.  time
B.  displacement
C.  velocity
D.  acceleration
D.  acceleration
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3. The gravitational force exerted on an object would most likely be represented by which force vector?

A.
B.
C.
D.
A.
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4. Which of the following situations describes inertia?

a. A stationary object tends to resist being moved.
b. A moving object tends to resist a change in speed.
c. A moving object tends to resist a change in direction
d. All of the above
d. All of the above
5. Which of the following statements describe an object in equilibrium?
I. The object is at rest.
II. The object is moving at constant velocity.
III. The net external force on the object is zero.

A. I and II
B. I and III
C. II and II
D. I, II, and III
D. I, II, and III
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6. In which situation is the net force acting on a car zero?

A. The car maintains both its speed and direction
B. The car maintains its speed but changes direction.
C. The car increases speed but does not change direction
D. The car increases speed and changes direction
A. The car maintains both its speed and direction
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7. In an action-reaction pair, the

A. action force and the reaction force are contact forces only
B. action force and the reaction force act on two different objects
C. action force and the reaction force are equal in magnitude and act in the same direction
D. action force is exerted first
B. action force and the reaction force act on two different objects
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8. The length of a force vector represents the

A. cause of the force
B. direction of the force
C. magnitude of the force
D. type of force
C. magnitude of the force
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9. If a nonzero net force is acting on an object, then the object is definitely

A. at rest
B. moving with a constant velocity
C. losing mass
D. being accelerated
D. being accelerated
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10. Which statement about the acceleration of an object is correct?

A. The acceleration of an object to the net external force acting on the object and inversely proportional to the mass of the object
B. The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object
C. The acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object
D. The acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the directly proportional to the mass of the object.
B. The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object.
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11. Centripetal acceleration must involve a change in

A. An object's tangential speed
B. An object's velocity
C. The radius of an object's circular motion
D. Both an object's speed and direction
B. An object's velocity
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12. What term describes a force that causes an object to move in a circular path

A. Centrifugal force
B. Centripetal force
C. Circular force
D. Centripetal acceleration
B. Centripetal force
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13. A centripetal force acts

A. Perpendicular to tangential speed but in the same plane
B. Perpendicular to the plane of circular motion
C. In the direction opposite tangential speed
D. In the same direction as tangential speed
A. Perpendicular to tangential speed but in the same plane
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14. What is the centripetal force that holds planets in orbit?

A. Inertia
B. Planetary force
C. Kepler's force
D. Gravitational force
C. Kepler's force
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15. The speed of an object orbiting another object depends on:

A. The masses of each object and the distance between them
B. Only the mass of the object being orbited
C. Only the mass of the orbiting object
D. The mass of the object being orbited and the distance between the objects
D. The mass of the object being orbited and the distance between the objects
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16. The centripetal force on an object in circular motion is:

A. In the direction opposite the centripetal acceleration
B. In the same direction as the tangential speed
C. In the direction opposite the tangential speed
D. In the same direction as the centripetal acceleration
D. In the same direction as the centripetal acceleration
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17. When an astronaut in orbit experiences apparent weightlessness,

A. No gravitational forces act on the astronaut
B. No forces act on the astronaut
C. The net gravitational force on the astronaut is not balanced by a normal force
D. The net gravitational force on the astronaut is zero
C. The net gravitational force on the astronaut is not balanced by a normal force
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18. If an object starts to accelerate,

A. A balanced force is action on it
B. Velocity is acting on it
C. Gravity is acting on it
D. An unbalanced force is acting on it
D. An unbalanced force is acting on it
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19. The tendency to resist a change in an objects motion is:

A. Work
B. Inertia
C. A balanced force
D. An unbalanced force
B. Inertia
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20. When forces are balanced, the total force:

A. Is zero
B. Is equal to the largest force
C. Is negative
D. Is greater than the sum of the forces
A. Is zero
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21. Newton's first law of motion explains:

A. Balanced forces
B. Unbalanced forces
C. Inertia
D. Force
C. Inertia
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22. The reaction force occurs _______ the action force.

A. After
B. At the same time as
C. Either a or b
D. Before
A. After
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23. Which describes how velocity changes with time?

A. Acceleration
B. Gravity
C. Inertia
D. Average speed
A. Acceleration
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24. A person who is not wearing a seat belt is involved in a head-on car crash. They continue to move forwards because of:

A. Weight
B. Inertia
C. Gravity
D. Friction
B. Inertia
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25. What is the term for speed at any instant in time?

A. Constant speed
B. Average speed
C. Instantaneous speed
D. Variable speed
C. Instantaneous speed
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26. Newton's first law of motion states that an object stays at rest unless a(n) ________ acts on it.

A. Unbalanced force
B. Strong force
C. Balanced force
D. Gravitational force
A. Unbalanced force
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27. Which of the following objects has the greatest inertia?

A. Bowling ball
B. Toothpick
C. Baseball
D. Pencil
A. Bowling ball
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28. A force is which one of these?

A. A push or pull
B. A pull
C. None of these
D. A push
A. A push or pull
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29. Force is measured in which unit?

A. Degrees
B. m/s^2
C. Newtons
D. Kilograms
C. Newtons
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30. A force is exerted on a box and an equal and opposite force is exerted by the box. What explains this?

A. Conservation of energy
B. Newton's first law of motion
C. Newton's third law of motion
D. Newton's second law of motion
C. Newton's third law of motion
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31. Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upwards along a y-axis.)

A. A cat jumps from a lower tree limb to a higher one
B. A cat jumps from the ground onto a tree limb
C. A cat jumps from a tree limb to the ground
D. A cat stands on a tree limb
C. A cat jumps from a tree limb to the ground
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32. Suppose you are given a position vs. time graph. The slope of a line drawn tangent to a point on the curve of this graph describes what quantity?

A. Displacement
B. Instantaneous velocity
C. Acceleration
D. Position
B. Instantaneous velocity
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33. When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion?

A. The car remains at rest
B. The car slows down
C. The car speeds up
D. The car travels at constant speed
B. The car slows down
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34. When a car's velocity is negative and its acceleration is negative, what is happening to the car's motion?

A. The car speeds up
B. The car slows down
C. The car travels at constant speed
D. The car remains at rest
A. The car speeds up
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35. Acceleration due to gravity is also called:

A. Displacement
B. Negative velocity
C. Instantaneous velocity
D. Free-fall acceleration
D. Free-fall acceleration
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36. Which of the following statements applies to the motion of a ball rising and then falling in free fall?
I. The ball has constant acceleration as it moves upward.
II. The ball has constant acceleration at the top of its path.
III. The ball has constant acceleration as it moves downward.

A. I and III
B. I, II, and III
C. I only
D. III only
B. I, II, and III
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37. A baseball catcher throws a ball vertically upwards and catches it in the same spot as it returns to his glove. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

A. At the top of its path
B. The instant it leaves the catcher's hand
C. The instant before it arrives in the catcher's glove
D. Midway on the way up
A. At the top of its path
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38. When there is no air resistance, objects of different masses dropped form rest:

A. Fall with different accelerations and with equal displacements
B. Fall with equal accelerations and with equal displacements
C. Fall with equal accelerations and with different displacements
D. Fall with different accelerations and with different displacements
B. Fall with equal accelerations and with equal displacements
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39. Objects that are falling towards Earth in free-fall move:

A. Slower then faster
B. Faster and faster
C. At a constant velocity
D. Slower and slower
B. Faster and faster
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40. Which would hit the ground first if dropped from the same height in a vacuum- a feather or a metal bolt?

A. They would be suspended in a vacuum
B. The metal bolt
C. They would hit the ground at the same time
D. The feather
C. They would hit the ground at the same time
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41. A dog walks from +4 m to +2 m. Which of the following statements is true about the dog's motion?

A. x= +2 m
B. Delta X = +2 m
C. Vavg = 2 m/s
D. x= +2 m
D. x= +2 m
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42. An object in free fall:

a. Experiences no air resistance
b. Undergoes a downwards acceleration
c. Has an acceleration with a magnitude of 9.81 m/s^2
d. All of the above
d. All of the above
 Author: Anonymous ID: 194254 Card Set: Physics Midterm Updated: 2013-01-21 21:47:16 Tags: Physics spirovsky Folders: Description: Physics Midterm Show Answers: