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OWL Chapter 2 Possible Short Answer/Essay Questions
1. You push on a crate with a force of 10 N to the right, and your friend pushes on the crate with a force of 25 N to the
left. Describe and explain the motion of the crate.
2. Forces of 10 N down, 10 N to the right, and 5 N to the left are acting on a ball. It accelerates horizontally to the
right. What other force, if any, is acting on the ball? Explain.
3. A book and a piece of paper the same size fall at different rates. How can you change the shape of the paper so that
it will fall nearly as fast as the book?
4. Two objects that have the same weight are dropped from a tall building. One object is larger and flatter than the
other. Explain why the larger object hits the ground last.
5. A net force of –10 N acts on a wagon moving at a constant velocity to the right. What happens to the wagon?
6. Kelly sits on a rock. Her weight is an action force. Describe the reaction force.
7. Explain why an object moves if the action-reaction forces are equal.
8. Is it necessary for an object to be in motion if it has forces acting on it? Why or why not?
9. "If no forces are acting on a moving object, it will eventually come to rest." Comment on this statement.
10. If you were playing football on the space station, would it be as hard to stop a 150-kg lineman as it would be on
Earth? Why or why not?
11. If a body is in motion at constant speed in a straight line, what, if any, forces could be acting on it?
12. Calculate the force on an object that has a mass of 12 kg and an acceleration of 4 m/s2.
13. A top-fuel dragster accelerates from rest to a velocity of 100 m/s in 8 s. What is the acceleration?
14. A pitcher releases a fastball that moves toward home plate. Other than the force exerted by the pitcher, what are
two forces that act on the ball as it travels between the pitcher and home plate? How does each of these forces change
the ball’s motion? Classify the forces acting on the ball as balanced or unbalanced.
15. Your friend stated that action and reaction force pairs do not change motion because they cancel one another out.
Explain why your friend is incorrect, using an everyday example to clarify your explanation. In your response, identify
which of Newton’s laws of motion applies to action and reaction forces. Contrast action and reaction force pairs and
balanced forces.