1. Forces and Motion

2. Motion
change of position

3. Speed
change of position over time
Speed = distance ÷ time

4. Velocity Speed AND direction of an object
Velocity is always written as speed and direction. For example: 25mph, north or 55km per hour, west.

5. Acceleration Any change in speed or direction
It takes more force to accelerate an object with a lot of mass than a smaller object.

6. Force
any push or pull
Force causes acceleration, more force causes MORE acceleration and less force causes LESS acceleration.

7. Inertia
the property of matter that keeps objects moving or keeps them at rest.

8. Gravity: force of attraction between Earth and other objects.
Gravitation: force of attraction between ANY two objects

9. Weight:
measure of gravitational force on an object

10. Friction force that resists motion between objects that are touching.
Friction causes objects to slow down and stop

11. What’s my speed? Speed = distance ÷ time
Ms. Calkins drove 120 miles to Atlanta. She got there in two hours. What was her speed?
A racehorse ran 3 miles in 3 minutes. What was its speed?
A rocket traveled 25 miles in 5 minutes. What was its speed?

12. Think it through!
Sally wants to move a heavy box. Explain why she would need to apply more FORCE to slide the box on a carpeted floor than a wood floor.
Why does a basketball left on the court stay in one place? What is needed before it moves? What determines how fast it moves and in what direction it moves?

13. Sally has to overcome the FRICTION caused by
the surface of the box touching the surface of
the floor. She has to apply more FORCE when
pushing across carpet.

14. Because of INERTIA, a ball will sit still until a FORCE is applied to it. If you push or kick the ball it will roll in the same direction that the force is applied. In other words, it goes the
way you push it.

15. That’s how to move it move it…