1. Newton’s Laws Physical Science

2. 10/15 Obj: To review 1 st Law and begin 2 nd Law HW – Solve Problems

3. Newton’s 1 st Law State the law and draw a picture or pictures demonstrating your understanding of the law.

4. Sir Isaac Newton 1643-1727 Lived & worked in England Made major developments in physics, mathematics, religion, geography, chemistry & optical science

5. “If I have been able to see further, it was only because I stood on the shoulders of giants.” —Sir Isaac Newton Sir Newton was born the year that Galileo died

6. Newton’s Laws Newton developed three laws that govern all motion. They are named Newton’s 1 st,2 nd, & 3 rd laws.

7. The Law of Inertia (Newton’s 1 st Law) Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

8. The Law of Inertia (Newton’s 1 st Law) to dislodge ketchup from the bottom of a ketchup bottle, the bottle is often turned upside down, thrust downward at a high speed and then abruptly halted. headrests are placed in cars to prevent whiplash injuries during rear-end collisions. while riding a skateboard (or wagon or bicycle), you fly forward off the board when hitting a curb, a rock or another object which abruptly halts the motion of the skateboard.

9. Inertia Inertia is an object’s resistance to change

10. Inertia Inertia is an object’s resistance to change http://www.lhup.edu/gp/PhysicsCl ub/demo_f00_eggdrop_2_movie. mov

11. A note about FORCE A force is a push or pull upon an object resulting from the object's interaction with another object. Force is measured in NEWTONS (N) 1 Newton = 1kg * 1m/s 2 FORCE is like velocity, it has a size AND direction and can be added the same way The NET FORCE or F NET = total of all forces

12. Newtons

13. Newton’s 2 nd Law Objects will only accelerate if they are acted upon by an unbalanced force This is shown by: F net = m * a m F a F=Force M=mass A=acceleration a=f÷m m=f÷a

14. Newton’s 2 nd Law How much net force is required to accelerate a 1000 kg car at 5.00 m/s 2 ? F = m * a F = 1000kg * 5.00m/s 2 F = 5000N 

15. Newton’s 2 nd Law What is the mass of an object that is accelerated to 20m/s 2 by 100N? m = F / a m = 100N / 20m/s 2 m = 5kg 

16. Newton’s 2 nd Law Because this triple-beam balance scale measures the mass (not the weight) of an object, it will read the same on any planet.

17. Newton’s 2 nd Law Is an unbalanced force acting on this car?

18. Newton’s 2 nd Law – a version MASS is how much there is of the object WEIGHT is the force required to support an object against the pull of gravity Weight = mass * gravity w = m*g

19. Newton’s 2 nd Law How much does a 25kg child weigh? w = m * g w = 25kg * 10m/s 2 w = 250N

20. Newton’s Second Law

21. Newton’s 3 rd Law "For every action, there is an equal and opposite reaction." Forces always come in pairs - equal and opposite action-reaction force pairs.

22. Newton’s 3 rd Law

24. A cyclist traveled at 12 km/h for 5 hours. How far did he travel?