Science Review 1

1. What are forces? How do forces affect the way things move?
2. How can you measure the amount of force that is needed to pull a toy car toward you?
3. Explain how putting sand on a icy road can help prevent cars from sliding.
4. Use the words balanced forces and unbalance forces to explain why the ball isn't moving. (Its on a slant, and not moving). What could change the motion of the ball?

1. A force is a push or pull that can make things move.
2. You can use a spring scale.
3. The sand creates friction, slowing the cars down.
4. The ball is not moving because of friction. A push or a pull could make it move.