1. Force, Motion & Energy: Newton’s 3 Laws
B. Davis & L. Blackburn
Mathematics & Science Center

2. Mass vs Weight Mass = measure of inertia
(resistance to change in motion)
Weight = force
(caused by gravity, affected by both planet size and mass of body)

3. Mass vs Weight Weight in pounds Mass in kilograms Mass in slugs
Weight in Newtons

4. Newton’s 3 Laws Sir Isaac Newton Late 1600’s England Legend of Apple
Invented Calculus
Prism and Light
Universal Law of Gravity
Phot from

5. 1st Law: Law of Inertia A body at rest will remain at rest And
A body in motion will remain in motion
Unless…

6. 1st Law: Law of Inertia A body at rest will remain at rest And
A body in motion will remain in motion
Unless…
Acted upon by an outside force

7. 1st Law: Law of Inertia Keep on keeping on Truck and Ladder Example
Buckling Up Example
Coin Flick Example
Egg Test
Hammer example

8. 2nd Law: Law of Acceleration
The acceleration of a body is:
Directly proportional to force
Inversely proportional to mass
Remember: acceleration is change in speed

9. 2nd Law: Law of Acceleration

10. 2nd Law: Law of Acceleration

11. 2nd Law: Law of Acceleration
Rhino example

12. Weight on other Planets
Weigh in

13. 3rd Law: Law of Reaction For every force on one body,
There is an equal
but opposite force
on another body.

14. 3rd Law: Law of Reaction For every action,
There is an equal but opposite reaction.

15. 3rd Law: Law of Reaction Forces always Come in pairs Equal in size
Opposite in direction
Acting on 2 different bodies

16. 3rd Law: Law of Reaction

17. 3rd Law: Law of Reaction
Pitched ball example

18. May the FORCE be with you !