Forces Homework Practice
| # | Answer |
|---|---|
| 1 | A force is a push or a pull on an object. |
| 2 | A force can make an object start moving, stop moving, speed up, slow down, or change direction. Any two are correct. |
| 3 | The table pushes up on the book with an upward support force, called the normal force. |
| 4 | Friction from the floor and air resistance act against the car’s motion, causing it to slow down. |
| 5 | Gravity pulls objects toward Earth. It is the force that makes things fall downward. |
| 6 | The force is balanced. The rope does not move because the pulls are equal in strength. |
| 7 | The net force is 12 newtons to the right. The wagon will move to the right. |
| 8 | Friction is causing the difference. Grass creates more friction than smooth pavement, so the ball slows down faster on grass. |
| 9 | The child could place the box on rollers, slide it on a smooth surface, or add wheels. Any one way that reduces friction is correct. |
| 10 | The total force to the west is 15 newtons, so the net force is 10 newtons to the east. The cart will move or speed up to the east. |