Physics
Ch 6 Newton’s Second Law
Practice Test
Name ___________________________________________
1. What are the relationships between acceleration, force, and mass?
2. Describe the velocity, acceleration, and forces acting on a body that has reached terminal velocity.
Draw a free body diagram.
3. A 2kg and a 4kg object are dropped out a window. Which has the greater force acting on it or are they
the same?
4. What would be the acceleration produced by a force of 10N acting on a 2 kg object? If the force were
doubled, how would acceleration be affected? If the force were tripled?
5. A 2kg rock sits on a table. What forces (including magnitudes) act on the rock? What are the net
forces?
6. What would be the pressure per square centimeter exerted by a 480N woman standing on a single
high heel with a surface area of 2 square centimeters?
7. If a sheet of heavy paper and a pencil with identical mass are dropped at the same time from a tall
building, which will hit the ground first? Why?
8.
Draw a free body diagram for a 6 kg book being accelerated to the right across a table.
9. A student pushes lightly against a box in an attempt to push it across a horizontal surface. The box,
however, does not move. Draw a free body diagram for this situation.
10. Draw a free body diagram of a 6 kg book being pushed with constant velocity.
11. Draw a free body diagram for a rock after it is thrown into the air. (ignore air resistance)
12. What is the net force on a 6 kg object if it goes from rest to moving at 12 m/s in 3 seconds?
13. How are the normal force and weight affected by an upward pull? A downward push? An incline?
14. You push with 27 N of force on a 10.0 kg trunk. If a frictional force of 7.0 N acts on the trunk, what will
be the acceleration of the trunk?
15. A 20.0 kg bag of cement is pulled with an upward force of 400.0 N. What will be the resulting
acceleration of the bag of cement?
16. Bronco, the 80.0 kg skydiver, accelerates downward at a rate of 7.5 m/s2. What is the force of air
resistance acting on Bronco?
17. A 1.0 kg bar of soap is pulled on a rope at a 25° incline with 3.0N of force. The soap moves with
constant velocity. Draw the free body diagram and write the sum of forces equations.
a.
How much frictional force acts on the brick?
b. What is the normal force acting on the brick?
c. If the soap hits a slippery spot and friction becomes only 1.0N, what would be the acceleration?