1. Sir Isaac Newton Laws of Motion
Physical Science
Mrs. Ishmael

2. Sir Isaac Newton 1. Described 3 laws that relate forces to motion
2. Force-a push or a pull, all forces have size and direction

3. Vocabulary
1. Friction- a force that opposes motion between 2 objects that are touching
2. Inertia-tendency of all objects to stay at rest or in motion
3. Mass- the amount of matter an object is made of
4. Weight- is the force of gravity on an object
5. Equilibrium- a state in which opposite forces are balanced

4. Mass Measure of the amount of matter in an object
The mass of an object DOES NOT change when it moves from place to place
Mass is measured in grams (g)

5. Example of Mass

6. Weight Weight is the measure of gravity on am object
Weight of an object CHANGES depending on where you are
Weight is measured in Newtons (N)
Gravity on Earth is 9.8 N/kg

7. Formula Weight(W) = mass(m) x gravity(g) W = mg
Example: Calculate the weight of a 5.0 kg backpack on Earth?
W = (5.0 kg) (9.8 N/kg)
W = 49 N

8. Newtown’s 1st Law of Motion “Law of Inertia”
An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force

9. Examples of Newton’s 1st Law of Motion
1. Car suddenly stops and you strain against the seat belt
2. Car turns left and you appear to slide to the right
3. The difficulty of pushing a car that won’t start

10. Examples of Newton’s 1st Law of Motion

11. Examples of Newton’s 1st Law of Motion

12. Newton’s Second Law of Motion
The acceleration of an object depends on the mass of the object and the amount of the force applied

13. Newton’s Second Law of Motion
1. Force- a push or pull, all forces have size and direction
2. Mass- the amount of matter an object is made of
3. Acceleration-the rate at which velocity changes; and object accelerates if its speed changes, if its direction changes and if both speed and direction changes

14. Formula

15. Examples of Newton’s 2nd Law

16. Examples of Newton’s 2nd Law

17. Newton’s Third Law of Motion
1. For every force, there is an equal and opposite force
2. Action and Reaction

18. Examples of Newton’s 3rd Law
1. 2 cars hit head on
2. Jumping out of a boat onto a dock
3. Astronauts in space

19. Example