Physics 011

MC#4

Ayman A.Ghannam

 Name: S#: ID#: Sec:
 Chapter 4: Motion and Force: Dynamics MC

 1

A non-zero net force acting on a body will have which effect?

The velocity of the body will remain constant.

The velocity of the body remains constant but the direction in which the body moves will change.

The velocity of the body will change.

None of the above.

 2

Body A has a mass that is twice as great as that of body B. If a force acting on body A is half the value of a force acting on body B, which statement is true?

The acceleration of A will be twice that of B.

The acceleration of A will be half that of B.

The acceleration of A will be equal to that of B.

The acceleration of A will be one fourth that of B.

 3

What is the magnitude of the net force required to impart an acceleration of magnitude 10 m/s2 to a body with a mass of 2.0 kg?

0.2 N

5 N

12 N

20 N

 4

Newton's second law can be stated as which of the following?

For every action there is an equal and opposite reaction.

Force and the acceleration it produces are directly proportional.

A body at rest tends to remain at rest unless acted upon by a force.

None of the above.

 5

If two forces act concurrently on a body, the resultant force will be greatest when the angle between them is:

0o

45o

90o

180o

 6

A force acting on a box can have one of the four orientations, A, B, C or D indicated below.

In which orientation will the force have the smallest vertical component?

A

B

C

D

 7

As the magnitude of the vector sum of the forces acting on a body increases, the magnitude of the acceleration of the body must

increase.

remain the same.

decrease.

either increase or decrease depending on the direction of the resultant.

 8

For a body experiencing zero acceleration, which statement is most true?

The body must be at rest.

The body may be at rest.

The body must slow down.

The body may speed up.

 9

The magnitude of the acceleration of a body is 2.5 m/s2 when it is acted on by a net force of the magnitude of which is 5.0 N. The mass of the body is:

0.5 kg

2.0 kg

12.5 kg

25 kg

 10

Which graph best represents the relation between the force of gravity and the mass of a free-falling body?

 11

The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao.

If the magnitude of the force was decreased slightly, the magnitude of the acceleration of the object would be ____ ao.

more than

equal to

less than

 12

The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao.

If this same force was exerted on a second object with mass m2 > mo, the magnitude of the acceleration of this second object would be ____ ao.

less than

more than

equal to

 13

The magnitude of the acceleration of an object of mass mo subjected to a single constant force of magnitude Fo is ao.

If the magnitude of the force was increased slightly, the mass of the object would ____.

remain constant

increase

decrease

be impossible to predict

 14

An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao.

If the magnitude of F1 was increased slightly, the magnitude of the acceleration of the object would ___.

increase

decrease

remain constant

be unpredictable

 15

An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao.

In order to double the magnitude of the acceleration of the object, F1 would have to be ____.

increased by 2N

increased by 3N

increased by 4N

increased by 5N

decreased by 2N

decreased by 3N

 16

An object of mass mo is simultaneously subjected to two forces: F1 = 6 N i and F2 = -3 N i. The magnitude of the acceleration of the object is ao.

If the magnitude of both forces was doubled, the magnitude of the acceleration of the object would be ao x ____.

1

2

3

4

6

8

 17

If the mass of a moving body is doubled, the inertia of the body will be

half as great as its original value.

twice as great as its original value.

four times as great as its original value.

unchanged from its original value.

 18

After a rocket is launched, its engines are shut off. The rocket continues to move in a straight line at constant speed. This is an example of

acceleration.

inertia.

gravitation.

action-reaction.

 19

What is the magnitude of the weight of a 2.0 kg body on or near the surface of the earth?

4.9 N

16 lbs

19.6 N

64 kg m s-2

 20

On a large asteroid, the weight of, or the force of gravity on, a 10 kg body is 20 N. What is the magnitude of the acceleration due to gravity on the asteroid?

0.5 m/s2

2.0 m/s2

9.8 m/s2

98 m/s2

 21

A box rests on a level table. Which of the following is an action-reaction pair of forces?

The weight of the box and the upward force on the earth.

The weight of the table and the upward force of the earth on any of the legs of the table.

Both A and B.

None of the above.

 22

A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ...

...the magnitude of the gravitational force exerted on the safe by the earth is ____ 1000 pounds.

more than

equal to

less than

 23

A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ...

...the magnitude of the gravitational force exerted on the earth by the safe is ____ 1000 pounds.

more than

equal to

less than

 24

A 1000 pound safe falls off the back of a flatbed truck as the truck travels with constant speed down the interstate. As the safe falls toward the ground, ...

...the magnitude of the acceleration of the earth toward the safe is ____.

9.8 m/s2

more than 9.8 m/s2

less than 9.8 m/s2 but greater than 0