1. Important Terms for Unit 4

2. FORCE
A PUSH or PULL.

3. SPEED
The rate at which someone or something is able to move or operate.

4. ACCELERATION
Increase in the rate of speed of something.

5. VELOCITY
Speed and direction.

6. INERTIA
A tendency to do nothing or remain unchanged.

7. UNBALANCED FORCE
When unequal forces cause objects to move.

8. BALANCED FORCE When 2 equal forces act on an object.
Generally, does NOT move.

9. FRICTION
Resistance when an object moves over another surface.

10. Amount of energy transferred by a force.
WORK
Amount of energy transferred by a force.

11. Speed vs Acceleration

12. What is speed?
The rate at which someone or something is able to move or operate.

13. What is acceleration?
Increase in the rate or speed of something.

14. How can I calculate speed?
Average Speed = Distance
Time

16. Graph what acceleration looks like on a distance/time graph:

17. Motion of a Line

18. Describe the motion:
Constant Speed
(Never changes speed)

19. Describe the motion: Object is NOT moving.
Time is changing, but distance is not.

20. Describe the motion:
Object is ACCELERATING.
Getting faster!

21. Describe the motion:
Object is turning around and headed back to its starting location.

22. Average Speed Examples

23. A quarterback throws a football 40 yards in 4 seconds
A quarterback throws a football 40 yards in 4 seconds. What is the average speed of the football?
Average Speed = Distance
Time

24. What is the average speed of the runner at 4 sec?

25. A plane flies from Houston to NYC in 4 hours
A plane flies from Houston to NYC in 4 hours. The distance it travelled was 1627 miles. What was the average speed of the plane?

26. What is the average speed of the boat between 4 and 6 minutes?