1. Newton’s Laws of Motion

2. Forces
What is a force?
A push or a pull

3. Forces What are some of the forces that connect to motion?
Contact force- when one object pushes or pulls on another by touching it.
Gravity- the force of attraction between two objects.
Friction- a force that resists motion between two surfaces that are pressed together.

4. Forces
Force is a vector. This mean force has both size and direction.

5. Forces Balanced Forces (does not change motion)
Same size- Opposite direction
Unbalanced Forces (can change motion)
Same size- Same direction
Different size- Same direction
Different size- Opposite direction

6. Sir Isaac Newton
In the mid-1600s, the English scientist Sir Isaac Newton studied the effects of forces on objects. He formulated three Laws of Motion.

7. Newton’s 1st Law
Objects at rest remain at rest, and objects in motion remain in motion with the same velocity, unless acted upon by an unbalanced force.

8. Newton’s 1st Law Inertia-
Inertia is the resistance of an object to a change in the speed or the direction of its motion.

9. Newton’s 2nd Law
The acceleration of an object increases with increased force and decreases with increased mass. (Force = mass x acceleration)

10. Newton’s 2nd Law Sample Problem #1
What force is needed to accelerate a 10kg shopping cart 3m/s?
Answer
Formula: F = ma
Substitute: F = (10kg)(3m/s)
Solve: F = 30 kg*m/s
Answer: F = 30 Newtons or 30N

11. Newton’s 3rd Law
Every time one object exerts a force on another object, the second object exerts a force that is equal in size and opposite in direction back on the first object.

12. Which law says that force is equal to mass times acceleration (F=MA)?
Quiz Time
Which law says that force is equal to mass times acceleration (F=MA)?

13. Quiz Time
2nd Law

14. Who was the scientist who gave us the Laws of Motion?
Quiz Time
Who was the scientist who gave us the Laws of Motion?

15. Quiz Time
Newton

16. Quiz Time
Which law says that heavier objects require more force than lighter objects to move or accelerate them?

17. Quiz Time
2nd Law

18. Quiz Time
Which law says that for every action there is an equal and opposite reaction?

19. Quiz Time
3rd Law

20. How many Laws of Motion are there?
Quiz Time
How many Laws of Motion are there?

21. Quiz Time 3

22. What is another name for the first law of motion?
Quiz Time
What is another name for the first law of motion?

23. Quiz Time
Law of Inertia

24. Which law explains why we need to wear seatbelts?
Quiz Time
Which law explains why we need to wear seatbelts?

25. Quiz Time
1st Law

26. Which law explains how rockets are launched into space?
Quiz Time
Which law explains how rockets are launched into space?

27. Quiz Time
3rd Law