Free Printable Friction HSC

1.

a)

A

b)

B

c)

C

d)

D

2.

a)

A

b)

B

c)

C

d)

D

3.

How can friction be reduced?

a)

reduce the force acting between the 2 surfaces

b)

reduce the roughness of the 2 surfaces coming in contact

c)

use wax, grease or oil

d)

all of the above are ways of reducing friction

4.

Friction is a force that acts in an ___________ direction of movement.

a)

similar

b)

opposite

c)

parallel

d)

west

5.

What type of friction is not moving?

a)

static

b)

sliding

c)

fluid

d)

rolling

6.

Which force will decrease if the surface of the

ramp is made smoother?

a)

gravity

b)

magnetism

c)

friction

d)

electricity

7.

Rough surfaces have _________

a)

greater friction

b)

less friction

c)

the same level of friction

8.

What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?

a)

65 N

b)

226 N

c)

175 N

d)

114 N

9.

The mass of a brick is 5kg, and it is stationary. What is the maximum static friction if the coefficient is 0.66?

a)

3.3

b)

33

c)

3.3N

d)

33N

10.

What is a friction force acting on an NON- moving object.

a)

Static friction

b)

Fuild friction

c)

Rolling friction

d)

Sliding Friction

11.

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.What is the magnitude of the frictional force that acts on the block?

a)

5 N

b)

8 N

c)

2 N

d)

0 N

12.

F_N=100N, F_f=20N

a)

μ=5.0

b)

μ=0.2

c)

μ=1.2

d)

μ=0.1

13.

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

a)

0.78

b)

0.51

c)

0.78 N

d)

0.58 N

14.

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box?

a)

81 N

b)

18 N

c)

98 N

d)

74 N

15.

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

a)

it is positive

b)

it is negative

c)

it is zero

d)

not enough information is given

16.

A 10-kg block is pushed against a vertical wall by a horizontal force of 100 N as shown in the figure. The coefficient of static friction, 𝜇_s, between the block and the wall is 0.60; and the coefficient of kinetic friction, 𝜇_k, is 0.40. Which one of the following statements is true, if the block is initially at rest?

a)

The block will slide down the wall because the force of static friction can be no larger than 60 N.

b)

The block will slide down the wall because the coefficient of kinetic friction is less than the coefficient of static friction.

c)

The block will remain at rest because the coefficient of static friction is greater than the coefficient of kinetic friction.

d)

The total force exerted on the block by the wall is directed horizontally.

17.

A 2.50 kg block is held motionless on a rough inclined plane by means of a string attached to a vertical wall as shown in the drawing. $\theta=15^o$ and the string is pulling with 10.0 N. What amount of static friction is present?

a)

6.34 N

b)

10.0 N

c)

3.70 N

d)

0 N

18.

A block of mass M is held motionless on a frictionless inclined plane by means of a string attached to a vertical wall as shown in the drawing. What is the magnitude of the tension in the string?

a)

Mg

b)

Mgcos $\theta$

c)

Mg tan 𝜃

d)

Mg sin 𝜃

19.

Under what condition(s) will an object be in equilibrium? (Hint: An object can be in static equilibrium or dynamic equilibrium).

a)

Only if the object is at rest can it be in equilibrium.

b)

If the object is either moving with constant velocity or with constant acceleration, it is in equilibrium.

c)

Only if the object is moving with constant acceleration can it be in equilibrium.

d)

If the object is either at rest or moving with constant velocity, it is in equilibrium.

20.

A 2.0-N rock slides on a frictionless inclined plane. Which one of the following statements is true concerning the normal force that the plane exerts on the rock?

a)

The normal force is 2.0 N

b)

The normal force is greater than 2.0 N

c)

The normal force is less than 2 N, but greater than 0 N

d)

The normal force is 0 N.

21.

A 2.0-N force acts horizontally on a 10-N block that is initially at rest on a horizontal surface. The coefficient of static friction between the block and the surface is 0.50.What is the magnitude of the frictional force that acts on the block?

a)

5 N

b)

8 N

c)

2 N

d)

0 N

22.

A 27.6 kg block is pulled along a rough level surface at constant velocity by the force . The figure shows the free-body diagram for the block. F_N represents the normal force on the block; and f represents the force of kinetic friction. The coefficient of kinetic friction is 0.30, what is the strength of P?

a)

4.0 N

b)

81 N

c)

270 N

d)

27.6 N

23.

A block is pulled along a rough level surface at constant speed by the force . The figure shows the free-body diagram for the block. F_N represents the normal force on the block; and f represents the force of kinetic friction. What is the magnitude of F_N?

a)

P

b)

f

c)

2mg

d)

mg

24.

A block of mass M is held motionless on a frictionless inclined plane by means of a string attached to a vertical wall as shown in the drawing. What is the magnitude of the tension in the string?

a)

Mg

b)

Mgcos $\theta$

c)

Mg tan 𝜃

d)

Mg sin 𝜃

25.

A 2.50 kg block is held motionless on a rough inclined plane by means of a string attached to a vertical wall as shown in the drawing. $\theta=15^o$ and the string is pulling with 10.0 N. What amount of static friction is present?

a)

6.34 N

b)

10.0 N

c)

3.70 N

d)

0 N

26.

At a playground, a child (m=30.0 kg) slides down a slide that makes a 42° angle with the horizontal direction. The coefficient of kinetic friction for the child sliding on the slide is 0.20. What is the magnitude of her acceleration during her sliding?

a)

4.6 m/s²

b)

9.8 m/s²

c)

5.1 m/s²

d)

6.4 m/s²

27.

Which type of friction is shown in the picture?

a)

rolling

b)

fluid

c)

static

d)

sliding

28.

If the following objects were dropped from the same height, which one would hit the floor first?

a)

b)

c)

29.

Which type of friction is shown in the picture?

a)

rolling

b)

static

c)

fluid

d)

sliding

30.

What is acceleration?

a)

transfer of energy to an object

b)

going faster

c)

a change in velocity (speed, direction, or both)

d)

an object remaining in motion or at rest until something changes it

31.

$F_{f^{ }}=\ \mu F_N$ When the normal force is increased, the force of friction...

a)

Increases

b)

Decreases

c)

Stays the Same

d)

Depends on the mass of the object

32.

The Normal Force acts

a)

90 degrees from the surface

b)

Parallel to the surface

c)

Opposite of the applied force

d)

Opposite the direction of motion

e)

Same Direction of Motion

33.

$F=\mu N$

is the formula of ........

a)

Friction

b)

precession

c)

gimbal

d)

Momentum

34.

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

a)

0.78

b)

0.51

c)

0.78 N

d)

0.58 N

35.

As the angle of the incline increases, what happens to the normal force?

a)

The normal force increases

b)

The normal force decreases

c)

The normal force is not affected by the incline

d)

The normal force is only dependent on the force due to gravity

36.

Given the FBD, which of the following must be true?

a)

The frictional force must be accelerating the system to the left.

b)

The box must be accelerating to the right.

c)

The box must be moving to the right.

d)

The FBD is incorrectly drawn. This situation isn't possible

37.

Which of the following is true about the system shown?

a)

The system is not accelerating.

b)

The tension between m₂ and m₁ is less than the tension between m₂ and m₃

c)

The acceleration of the system only depends on m₃

d)

None of the other answers are true

38.

Which of the following is not true about the system?

a)

T₃ is equal to the scalar sum of the magnitudes of T₂ and T₁

b)

T₃ is equal in magnitude to F_g

c)

The x- components of the T₁ and T₂ and equivalent but in opposite directions

d)

The system is in equilibrium.

39.

If there is no friction, then the acceleration would be equal to

a)

mg

b)

sin(θ)mg

c)

g

d)

sin(θ)g

40.

If μ_k = 0.65 and μ_s = 0.7, acceleration would be equal to

a)

0 m/s/s

b)

9.8 m/s/s

c)

3.35 m/s/s

d)

-2.63 m/s/s

41.

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

a)

0.78

b)

0.51

c)

0.78 N

d)

0.58 N

42.

Assuming both objects are at rest, which object is more massive? M1 or M2?

a)

M1 is more massive

b)

M2 is more massive

c)

both M1 and M2 are the same mass

43.

A mass, M, is released from rest on an incline that makes a 40 degree angle with the horizontal. In 5 seconds, the mass is observed to have gone a distance of 2 m. What is the coefficient of kinetic friction between the mass and the surface of the incline?

a)

0.97

b)

0.7

c)

0.86

d)

1.2

e)

2.55

44.

A car travels up a hill at constant speed. Which of the following diagrams best represents the forces acting on the car at this instant?