1. QQ:
1. A car has a mass of 2,000 kg and is traveling at 28 meters per second. What is the car’s kinetic energy?
2. A Jet that weighs 100,000 kg cruising at a velocity of 600 m/s at a height of 10,000 meters. What is its potential energy?
3. Ivonne hits a softball with an acceleration of 40 m/s2. The mass of the softball is 180 g. What is the force of her swing?

2. Today’s Objective: I can explain and predict an object’s motion using Newton’s Laws of Motion.

3. What caused the original penny to start moving?
Force: push or pull
Causes a change in velocity

4. Newton’s First law of Motion
* The state of motion of an object does not change as long as the net force acting on it is zero.
Newton’s First law of Motion

6. Inertia:
The tendency of an object to
resist a change in motion

7. Inertia: The Driving Force Behind Magic?

9. Force is a vector – has direction
Balance
Combine

10. Unbalanced causes object to accelerate

11. Use vector addition to determine the direction of acceleration.

12. 300 N
250 N
550 N

13. 350 N
200 N
150 N

14. Force that opposes motion as they move past each other
Friction:
Force that opposes motion as they move past each other

15. *Opposite direction of movement
Static Friction
*Not moving
*Opposite direction of movement

16. Static Friction

17. *Keeps going after starts
Sliding Friction
*moving object
*Keeps going after starts

18. Sliding Friction

19. *acts on rolling object
Rolling Friction
*acts on rolling object
*relatively weak
*bends both
out of shape slightly

20. Rolling Friction

21. Fluid Friction
*air or water
*opposes motion
*air resistance

23. A world without friction....

24. Newton’s 2nd Law of Motion
The acceleration of an object is equal to the net force acting upon it divided by the object’s mass.

25. 2nd Law of Motion
F = ma
F = force
M = Mass
A = Acceleration

26. According to Newton’s 2nd Law of Motion, which has the greatest acceleration?

27. m = 1000 kg m = 1 kg F = ma 1 N = 1 Kg*m/s2 F = 1kg * 9.8m/s/s
F = 9800 N
F = 9.8 N

28. Lizette’s car has a mass of 1000 kg
Lizette’s car has a mass of 1000 kg. She accelerates from a stop when the light turns green. The force on the car is 4000 N in the forward direction. What is the car’s acceleration?

29. m = 1000kg a = ? F = 4000 N Choose formula: Isolate Data: F = ma
Substitute:
4000N = 1000kg * a
Solve:
4000N = a
1000kg
4 N = 4 kg * M/s2
Kg kg
= 4m/s2

30. The mass of JJ’s car is 1,644 kg. What is the weight of her car?

31. m = 1644 kg w = Fg = ? g = 9.8 m/s2 m = 1644 kg w = ? m = 1644 kg
Isolate Data:
m = 1644 kg
w = Fg = ?
g = 9.8 m/s2
Isolate Data:
m = 1644 kg
w = ?
Isolate Data:
m = 1644 kg
w = Fg = ?
Choose formula:
Fg = mg
Substitute:
Fg = 1644kg * 9.8 m/s2
Solve:
Fg = N
Solve:
Fg = kg * m/s2