1. Today’s Science Starter:
Day 2: Forces and Motion

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3. Speed vs. Acceleration Increase or decrease in the rate of speed
Rate of movement or operation
Average speed = Distance / Time
Increase or decrease in the rate of speed
Change in direction

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5. A Quarter back throws a football 40 yards in 4 seconds
A Quarter back throws a football 40 yards in 4 seconds. What is the average speed of the ball?

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

13. Get out your plickers

14. Graph of acceleration

15. Direction – course of movement
Velocity
Speed + Direction
Direction – course of movement

16. Motion
Movement

17. Balanced vs. Unbalanced forces
Forces are equal and opposite
No motion
Opposing forces are opposite but not equal
Causes movement in the direction of the greater force

18. Net force
Calculated by adding same direction forces and subtracting opposing forces
Gives direction of movement

19. Practice Problems:

20. Solution: Net force = 0N

21. Practice problem:

22. Solution: Net force = 400N downward

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