##### Newton's Laws

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1

Which of the following statements does not describe force?
a. Force causes objects at rest to remain
stationary
b. Force causes objects to start moving
c. Force causes objects to stop moving
d. Force causes objects to change direction

a. Force causes objects at rest to remain stationary

2

What causes a moving object to change direction?
a. acceleration
b. velocity
c. force
d. inertia

c. force

3

Which of the following forces exists between objects even in the absence of direct physical contact?
a. frictional force
b. fundamental force
c. contact force
d. field force

d. field force

4

A free-body diagram of a rising ball in the presence of air resistance would show
a. a downward arrow to represent the force of
air resistance
b. only a downward arrow to represent the force
gravity
c. a downward arrow to represent the force of
gravity and an upward arrow to represent the
force of air resistance
d. a downward arrow to represent the force of
gravity and a downward arrow to represent the
force of air resistance

d. a downward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance

5

Which of the following is the tendency of an object to maintain its state of motion?
a. acceleration
b. inertia
c. force
d. velocity

b. inertia

6

A car goes forward along a level road at a constant
velocity. The additional force needed to bring the car into equilibrium is
a. greater than the static frictional force
b. equal to the static frictional force
c. equal to the kinetic frictional force
d. zero

d. zero

7

If a nonzero net force is acting on an object, than the object is definitely
a. at rest
b. moving with a constant velocity
c. being accelerated
d. losing mass

c. being accelerated

8

Which statement about the acceleration of an object is correct?
a. The acceleration of an object is directly
proportional to the force acting on the object
and inversely proportional to its mass.
b. The acceleration of an object is directly
proportional to the force acting on the object
and directly proportional to its mass.
c. The acceleration of an object is inversely
proportional to the force acting on the object
and inversely proportional to its mass.
d. The acceleration of an object is inversely
proportional to the force acting on the object
and directly proportional to its mass.

a. The acceleration of an object is directly proportional to the force acting on the object and inversely proportional to its mass.

9

The statement by Isaac Newton that for every action there is an equal but opposite reaction is his
a. first law
b. second law
c. third law
d. fourth law

c. third law

10

As a basketball player starts to jump for a rebound, the player begins to move faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the players shoes is
a. greater than the players weight
b. equal in magnitude and opposite in direction
to the players weight
c. less than the players weight
d. zero

a. greater than the players weight

11

The magnitude of the force of gravity acting on an object is
a. frictional force
b. mass
c. inertia
d. weight

d. weight

12

A measure of the quantity of matter is
a. density
b. weight
c. force
d. mass

d. mass

13

A ball is thrown vertically upward from the surface of the Earth. Take g to be constant and neglect air resistance. While the ball is in flight, the force on the ball
a. increases as it rises
b. decreases as it rises
c. is largest when the ball is at maximum height
d. is the same everywhere
e. None of these

d. is the same everywhere

14

An object is acted on by a constant force that always acts perpendicular to its velocity. Which of the following is constant?
a. the speed of the particle
b. the acceleration of the particle
c. the coordinate parallel to to velocity
d. all of these

a. the speed of the particle

15

When a moving car is brought to a stop with the brakes, its acceleration vector is
a. in the same direction as the velocity vector
b. in the opposite direction of the velocity
vector
c. equal to zero
d. directed downward

b. in the opposite direction of the velocity vector

16

The vector that represents the net force applied to an object will always be in the same direction as
a. the velocity vector
b. the displacement vector
c. the mass vector
d. the acceleration vector

d. the acceleration vector.

17

An object is moving north at constant speed. We can state that
a. the net force is towards the south
b. the net force is towards the north
c. the net force is either east or west
d. the net force is zero

d. the net force is zero

18

An object is thrown straight up. At the top of its trajectory the object is
a. instantaneously in equilibrium
b. instantaneously at rest
c. instantaneously both in equilibrium and at rest
d. none of the above

b. instantaneously at rest

19

A mass is suspended from a string and accelerates downward with an acceleration of 0.7g. It follows that the tension in the string is
a. equal to the weight of the mass
b. not zero but less than the weight of the mass
c. greater than the weight of the mass
d. zero

b. not zero but less than the weight of the mass

20

A block whose weight is 20N rests on a horizontal surface. A string is attached to the block and pulled with a horizontal force of 15N. The coefficient of static friction between the block and the surface is 1.0. Which of the following is true?
a. The force of friction acting on the block is
20N
b. The force of friction acting on the block is
15N
c. The force of friction acting on the block is
5N
d. The force of friction cannot be determined
because the normal force between the block and
surface is not known.

b. The force of friction acting on the block is 15N