1. Forces and Friction
What are Forces?
Lesson 1

2. Force A force is a push or pull on an object to make it move. push

3. Moving object
A moving object will travel in a straight line if it is not touched.

4. Gravity
Gravity is a force that pulls things down.

5. Lesson 2
How Do Magnets Work?

6. Magnet
A magnet’s force can move something without touching it.

7. More Magnets
A magnets force can attract objects through air, water and some solids.

8. The poles of a magnet are at its ends. Magnets have
Magnets Again
The poles of a magnet are at its ends. Magnets have
a north and south pole.

9. The force of a magnet is strongest at the poles and weakest in the middle.

10. Opposite poles attract, or pull together.
North
South
South
North

11. Poles that are alike repel each other, or push each other away.
South and south or North and north will repel each other.

12. A magnet is used to make a compass. The magnet always points north

13. How Can We Measure Motion?
Lesson 3
How Can We Measure Motion?

14. Weight, friction, and distance, affect the force needed to move objects

15. Motion is when something moves.

16. It takes less force to move something light than something heavy.

17. It takes less force to move something on a smooth surface than on a rough surface

18. It takes less force to move something a short distance than a long distance.