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- 1. Multiple Choice
A cube slides down the surface of a ramp at a constant velocity. What is the magnitude of the frictional force that acts on the cube due to the surface?
The weight of the cube
The component of weight of the cube parallel to the plane
The component of weight of the cube perpendicular to the plane
The component of the normal reaction at the surface parallel to the plane
- 2. Multiple Choice
A box is accelerated to the right across rough ground by a horizontal force Fa. The force of friction is Ff. The weight of the box is Fg and the normal reaction is Fn. Which is the free-body diagram for this situation?
- 3. Multiple Choice
Two blocks of weight 5 N and 2 N are attached to two ropes, X and Y.
The blocks hang vertically. The mass of the ropes is negligible. What is the tension in X and the tension in Y?
7N, 7N
7N, 2N
5N, 2N
5N, 3N
- 4. Multiple Choice
A cart of mass 4.0 kg is being pulled with a force of 24 N. The cart accelerates at 3.0m s–2. What is the net force on the cart?
6.0 N
8.0 N
12 N
24 N
- 5. Multiple Choice
Two boxes in contact are pushed along a floor with a force F. The boxes move at a constant speed. Box X has a mass m and box Y has a mass 2m..
What is the resultant force acting on Y?
0
F/2
F
2F
- 6. Multiple Choice
A constant force of 12 N is applied for 3.0 s to a body initially at rest. The final velocity of the body is 6.0m s–1. What is the mass of the body?
1.5 kg
6.0 kg
24 kg
36 kg
- 7. Multiple Choice
A force F acts on a block at an angle θ with respect to a horizontal surface.
The block is moving with a constant velocity v along the surface. A resistive force acts on the block.
Which of the following correctly represents the forces acting on the block?
- 8. Multiple Choice
An object falls vertically from rest. Air resistance acts on the object and it reaches a terminal speed. Which of the following is the distance–time graph for its motion?
- 9. Multiple Choice
A block rests on a rough horizontal plane. A force P is applied to the block and the block moves to the right.
There is a coefficient of friction giving rise to a frictional force F between the block and the plane. The force P is doubled. Will the coefficient and F be unchanged or greater?
unchanged, unchanged
unchanged, greater
greater, greater
greater, unchanged
- 10. Multiple Choice
A waiter carrying a tray is accelerating to the right as shown in the image.
What is the free-body diagram of the forces acting on the tray?
- 11. Multiple Choice
Three forces act at a point. In which diagram is the point in equilibrium?
- 12. Multiple Choice
A small, positively-charged ball is suspended in equilibrium from the vertical wall by a thread of negligible mass.
What is the resultant force acting on the ball?
Tension
Weight
Zero
Electric force
- 13. Multiple Choice
A student is sitting on a chair. One force that is acting on the student is the pull of gravity. According to Newton’s third law, there must be another force which is
the upward force on Earth
the upward push of the chair on the student
the downward force on the student
the downward push of the chair on Earth
- 14. Multiple Choice
A skydiver of mass 90 kg falls vertically with a constant speed of 20 m s–1. The upward force acting on the skydiver is approximately
0 N
90 N
900 N
1800 N
- 15. Multiple Choice
Two forces act along a straight line on an object that is initially at rest. One force is constant; the second force is in the opposite direction and proportional to the velocity of the object.
What is correct about the motion of the object?
The acceleration increases from zero to a maximum.
The acceleration increases from zero to a maximum and then decreases.
The velocity increases from zero to a maximum.
The velocity increases from zero to a maximum and then decreases.
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