1. Chapter 7
Motion

2. Motion
A change in position

3. Elapsed Time
The length of time that passes from one event to another

4. Speed
The rate at which the position of an object changes

5. Distance
The length of the path between two points

6. Speed Calculation Distance 50 yards
Average speed = ________ = __________
Time sec

7. Distance Calculation Distance = speed X time 50yards = 8.771 X 5.7
Distance =_________x sec
1 hour

8. Calculating Time Speed = distance ___________ Time 50 yds
_______ = 5.7
8.771

9. Constant Speed
Speed that does not change

10. Velocity
The speed and direction in which an object is moving

11. Acceleration
The rate of change in velocity

12. Deceleration The rate of slowdown
Acceleration = change in speed / change in time
Acceleration= 40km/1hr divided by 5sec/1
Acceleration= 40km / 1hr X 1/5 sec
Acceleration= 8km/hr per sec

13. Force
A push or a pull

14. Friction
A force that opposes motion and that occurs when things slide or roll over each other.

15. The first law of motion
Newtons first law of motion states that if no force acts on a object at rest, it will remain at rest. The law also says that if the object is moving, it will continue moving at the same speed and in the same direction if no force acts on it.

16. Inertia
The tendency of an object to resist changes in its motion.

17. Second Law of Motion
The amount of force needed to produce a given change in the needed to produce a given change in the motion of an object depends on the mass of object. The larger the mass, the more force is needed to give it a certain acceleration.

18. Gravity
The force of attention between any two objects that have mass

19. Law of Universal gravitation
Gravitational Force depends on the mass of the two objects involved and on the distance between them.