WorksheetsAP Physics Friction
Total questions: 25
Worksheet time: 25mins
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?
it is positive
it is negative
it is zero
not enough information is given
What direction does friction act relative to sliding?
in the same direction
in the opposite direction
need more information
depends on the force
What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?
65 N
226 N
175 N
114 N
A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box?
81 N
18 N
98 N
74 N
Normal force is
Always opposite the weight
Always parallel and down the incline
Always perpendicular to the surface
It depends on the direction of motion
Which of the following is the best expression for the Normal Force?
FN = mg cos(ϴ)
FN = mg sin(ϴ)
FN = mg sin(180-ϴ)
FN = mg cos(90-ϴ)
A box weighing 46 newtons rests on an incline that makes an angle of 25° with the horizontal. What is the magnitude of the component of the box’s weight perpendicular to the incline?
19N
21N
42N
26N
A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of frictional force?
A
B
C
D
A 10.-newton block is sliding down a 30-degree incline at a constant speed. What is the force of friction?
5N
4.9N
10N
98N
A 1.0 × 105-newton truck at rest on a hill that makes an angle of 8.0° with the horizontal. What is the component of the truck’s weight parallel to the hill?
1.4E3N
1E4N
1.4E4N
9.9E4N
A 220 Kg crate is pushed horizontally with a force of 700 N. If the coefficient of kinetic friction is 0.20, calculate the acceleration of the crate.
1.02 m/s2
1.22 m/s2
1.42 m/s2
1.62 m/s2
A book is pushed across the table. It has a friction force of 50 N and a coefficient of friction of 0.30. Find the value normal force.
16.7 N
166.67 N
15 N
What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?
0.78
0.51
0.78 N
0.58 N
Friction acts in a direction_______ to the direction of an object's motion.
unrelated
equal
opposite
perpendicular
What are the units on the coefficient of friction?
none
Newtons
meters
kilograms
Assuming both objects are at rest, which object is more massive? M1 or M2?
M1 is more massive
M2 is more massive
both M1 and M2 are the same mass
A block of mass 5 kg is placed on a rough horizontal surface. If the coefficient of static friction is 0.4, what is the maximum horizontal force that can be applied to the block without moving it?
10 N
20 N
15 N
25 N
A car is moving on a road with a constant speed. If the coefficient of kinetic friction between the tires and the road is 0.3, what is the frictional force acting on the car if its weight is 1500 N?
450 N
500 N
400 N
350 N
A 10 kg box is sliding down a 30-degree incline. If the coefficient of kinetic friction is 0.2, what is the acceleration of the box?
2.5 m/s^2
3.5 m/s^2
4.5 m/s^2
5.5 m/s^2
What is the role of friction in a car's ability to turn on a curved road?
It provides the centripetal force needed for turning
It opposes the motion of the car
It increases the speed of the car
It has no effect on turning
A block is at rest on an inclined plane. If the angle of the incline is increased, at what point will the block start to slide?
When the angle is equal to the angle of repose
When the angle is greater than the angle of repose
When the angle is less than the angle of repose
The block will never slide
A 50 kg crate is pushed with a force of 200 N on a horizontal surface. If the coefficient of kinetic friction is 0.25, what is the net force acting on the crate?
75 N
100 N
125 N
150 N
In an experiment, a block is pulled across a surface with a spring scale. If the reading on the scale is 30 N and the block moves with constant velocity, what can be said about the frictional force?
It is greater than 30 N
It is less than 30 N
It is equal to 30 N
It is zero
A sled is being pulled across snow with a force of 100 N. If the coefficient of friction between the sled and the snow is 0.1, what is the weight of the sled?
1000 N
500 N
200 N
100 N
A block is sliding down a frictionless incline. If a rough patch is encountered with a coefficient of friction of 0.3, what happens to the block's speed?
It increases
It decreases
It remains constant
It becomes zero
