2. CHAPTER 1 MOTION

3. Whether or not an object is in motion depends on the reference point you choose.

4. RECOGNIZING MOTION An object is in MOTION when its distance from another object is changing.

5. Calculating Speed Most objects do not move at a constant speed. Cyclists change their Speed many times during a race.

6. HOW TO FIND AVERAGE SPEED TOTAL DISTANCE / TOTAL TIME Suppose a cyclist travels 32 km during the first two hours and 13 km during the next hour. TOTAL DISTANCE = 32km + 13km TOTAL TIME = 2 hours + 1 hour Average speed = 45km/3 hours = 15km/h

7. DESCRIBING VELOCITY Speed in a given direction is called velocity. If you know the velocity of the Rollercoaster - you know two things about it’s motion : It’s speed and direction

8. Changing Speed & Direction hh A basketball player changes his direction and speed depending on what he sees on the court.

9. Golf ball motion What are some things that might effect how far and in what direction the golf ball might travel?

10. ACCELERATION Acceleration is the rate in which VELOCITY changes. Recall that velocity has two components (speed and direction) In science, acceleration refers to increasing speed, decreasing speed, or changing direction.

11. ACCELERATION CAN YOU IDENTIFY SOME CHANGES IN MOTION OF THE SURFER?

12. CALCULATING ACCELERATION Acceleration = Final velocity - Initial velocity Time The unit for acceleration is written as : meters/second