| A | B |
|---|
| In interaction between the hammer and the nail it hits, is a force exerted on the nail? On the hammer? How many forces occur in this interaction? | Yes; Yes; Two |
| When a hammer exerts a force on a nail, how does the amount of force compare with that of the nail on the hammer? | Same: both are part of one interaction. |
| When you walk along the floor, what pushes you along? | The floor. |
| When swimming, you push the water backward. Call this action. What is the reaction force? | Water pushing you forward. |
| If the action is a bowstring acting on an arrow, identify the reaction force. | Arrow acting on bowstring. |
| When you jump up, the world really does recoil downward. Why can't this motion of the world be noticed? | The acceleration is too small because of the world's large mass. |
| When a cannon is fired, how does the sie 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. | Same: The acceleration is large ofr the cannonball, but small for the cannon. |
| How can a rocket be proppelled above the atmosphere where there is no air resistance? | It is propelled by the reaction force of the gas pushing on the rocket. |
| In the interaction between the apple and the orange, how many forces are exerted on the apple? On the orange? Are these forces equal in strength? Are these forces opposite in direction? | One; One; Yes; Yes |
| Consider the orange system. Do action and reaction forces cancel each other in the orange system? Does the orange system accelerate? | No; yes |
| Consider the orange-apple system. Do action and reaction forces cancel each other in this system? Do the orange and apple accelerate away from each other, or do they remain together? | Yes; They remain together |
| Newton's Third Law | Action-Reaction |
| Action force | One of two forces that work together in Newton's third law. Both are equal and opposite to each other. |
| Reaction force | The equal and opposite force of action. |
| interaction | a mutual action between one thing and another. |
| in the horizontal direction, how many forces are exerted on the cart? | Two: P and f |
| What is the net force on the cart? | P-f |
| How many horicontal forces are exerted on the horse? | Two: P and F. |
| What is the net force on the horse? | F-P |
| How many horizontal forces are exerted by the horse on other objects? | Two: F and P |
| How many horizontal forces are exerted on the horse and cart system? | Two: F and f |
| What is the net horizontal net force on the horse-cart system? | F-f |
| In order to increase it's speed, why must the horse push harder against the ground than it pulls on the wagon? | So the net force on it will exceed zero. |
| If you hit a wall with a force of 200 N, how much force is exerted by you? | 200 N |
| Why can't you hit a feather in midair with a force of 200 Newtons? | It cannot exert 200 N force on you. |
| How does the saying you get what you give relate to Newton's third law? | Getting and giving are similar to the action-reaction in an interaction. |
