1. Chapter 10 Forces

2. Force and Net Force Force is a push or a pull on an object.
Net force is the total force on an object.

3. Unbalanced Force Balanced Force
The balanced forces are the forces in equal and opposite directions.
Unbalanced Force can cause an object to move, stop moving, or change direction.

5. Forces change motion.

6. HMM…. Can you see the unbalanced force here?

8. Newton’s First Law Inertia
An object at rest will stay at rest unless acted upon by an outside force.
Inertia is every objects resistance to change its motion.
Greater mass
means
Greater inertia

13. Take out a piece of paper and label it “Inertia Mini Lab”

14. Newton’s Second Law
The acceleration of an object is directly proportional to the net force acting on the object and inversely proportional to the object’s mass.

15. Force=mass x acceleration
F=m x a Or
a = Force/ mass
a = F/m

16. Equation for Newton
It’s the same as the force equation!
Newton=m x a.

17. Force and mass determine acceleration.

18. Luke! Use the mass times the acceleration!

19. Sometimes we might calculate mass using Force and Acceleration
Mass=Force/Acceleration
m=F/a

20. How much Force was required to make a 2000kg car accelerate at 5m/s/s?
400N
0.001N
10,000N
Force=Mass x acceleration
F=ma
F=2000kg x 5m/s/s
a= 10,000N or kgxm/s/s

21. If you drop a 15kg bowling ball with a Force of 147N, what is it’s acceleration?30
9.8m/s/s
0.1m/s/s
2,205m/s/s
Acceleration=Force/Mass
a=F/m
a=147kgxm/s/s÷15kg
a= 9.8m/s/s

22. A person throws a baseball at an acceleration of 25m/s/s with 12
A person throws a baseball at an acceleration of 25m/s/s with 12.5N of Force. What’s the Mass of the ball?
312kg
.5kg
2kg
Mass=Force/Acceleration
m=F/a
a=12.5kgxm/s/s÷25m/s/s
a= .5kg

23. Friction

24. 4 Types of Friction The 4 types of friction are:
Sliding friction (strongest)
Rolling friction
Fluid friction (weakest).
Static friction

25. What type of friction?

26. What type of friction?

27. What type of friction?

28. What type of friction?

29. 2 Factors of Friction 1-Type of surface.
2-How hard the two surfaces push together.

30. Which type of hockey has more friction?

31. Gravity

32. Air Resistance and Weight
Air resistance is a type of fluid friction on falling objects. Weight is the force of gravity on an object at the surface of the Earth.

34. Law of Universal Gravitation
Gravity acts between all objects in the universe.

35. Gravity Between Objects
The force of gravity between objects increases with greater mass and decreases with greater distance.

37. Gravity

38. Gravity is the force that pulls objects toward the Earth- acceleration due to gravity is 9.8m/s/s.

40. Newton’s Third law
If an object exerts a force on another object, the second object, exerts an equal force in the opposite direction.

45. Momentum = mass x velocity
The momentum of an object is the product of its mass and velocity.
In other words:
Momentum = mass x velocity
Kg x m/s

46. COLLISIONS

48. Law of Conservation of Momentum
The total momentum of the objects that interact does not change.