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- 1. Multiple Choice
What is the frictional force on a 25-N object sliding along a horizontal surface at constant speed if the coefficient of kinetic friction is 0.40?
10 N
25 N
4.0 N
8.0 N
- 2. Multiple Choice
A 50.0-N box rests on an inclined plane whose angle of inclination is 30.0 degrees. What is the normal force acting on the object?
25 N
32 N
43 N
50 N
- 3. Multiple Choice
A 25-N box lies on top of a 50-N box. What is the normal force acting on the 50-N box?
There is none.
25 N
50 N
75 N
- 4. Multiple Choice
A 65-N box rests on an a 40.0-degree inclined plane. What is the coefficient of static friction if the box were to experience pending motion at this angle?
0.50
0.64
0.72
0.83
- 5. Multiple Choice
A 60-N box moves on a 65-degree inclined plane. If the coefficient of kinetic friction is 0.25, by how much is the box accelerated?
7.8 m/s/s
9.8 m/s/s
3.2 m/s/s
1.9 m/s/s
- 6. Multiple Choice
Which of the following statement about friction is not true?
Friction is always parallel to the contact surface.
Friction is always opposite the direction of motion.
Frictional force is inversely proportional to the normal force of the object.
Friction does not depend on the area of contact between the object and the surface
- 7. Multiple Choice
Which is the unit for the coefficient of friction?
newton
N/m2
N-m
It is dimensionless.
- 8. Multiple Choice
What is the normal force exerted by the ground on a 65-kg metal bar?
65 N
640 N
-65 N
-640 N
- 9. Multiple Choice
Which explains why there is less force needed once a heavy object starts moving from an initial state of rest?
The inertia of the object is now less than when it is at rest.
The force exerted is now greater than the normal force.
The parallel force is now greater than the weight of the object.
The coefficient of kinetic friction is less than the coefficient of static friction.
- 10. Multiple Choice
The normal force on an object is a consequence of which law?
First Law of Motion
Second Law of Motion
Third Law of Motion
Law of Universal Gravitation
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