1. In the interaction between a hammer and the nail hits it, is a force exerted on the nail? On the
hammer? How many forces occur in this interaction?
2. When a hammer exerts a force on a nail, how does the amount of force compare with that of the nail
on the hammer?
3. When you walk along a floor, what pushes you along?
4. When swimming, you push the water backward- call this action. What is the reaction force?
5. If the action is a bowstring acting on an arrow, Identify the reaction force.
6. When you jump up, the world really does recoil downward. Why can't this motion of the world be
noticed?
7. When a cannon is fired, how does the size of the force of the cannon on the cannonball compare with
the force of the cannonball on the cannon? How does the acceleration of the cannon compare with
that of the cannonball? Defend your answer.
8. How can a rocket be propelled above the atmosphere where there is no air to "push against"?
9. In order to increase its speed why must the horse push harder against the ground than it pulls on the
wagon?
10. If you walk on a log that is floating in the water, the log moves backward. Why?
11. Draw a picture that shows Newtons 3rd Law, Identify and explain what is happening.