1. A force is a push or a pull on an object.

2. Forces can make an object start moving.

3. Forces can stop a moving object.

4. Forces can change the speed of an object.

5. Forces can change the direction of a moving object.

6. Forces can change the shape of an object.

7. Contact forces happen when objects touch each other.

8. Non-contact forces act without touching, like gravity and magnetism.

9. Friction is a contact force that slows down moving objects.

10. The effect of a force depends on its strength and direction.