1 / 25

# Newton’s 2 nd Law

Newton’s 2 nd Law. In this lesson, we will be focusing on Newton’s 2nd Law of Motion. This law is all about the connections between force , mass , and acceleration . Let’s find out more from the characters in Eureka. 3 2nd Law/Speed. 2 X. 1 X. 1 X. 2 X. The red ball has twice

Télécharger la présentation

## Newton’s 2 nd Law

E N D

### Presentation Transcript

1. Newton’s 2nd Law

2. In this lesson, we will be focusing on Newton’s 2nd Law of Motion. This law is all about the connections between force, mass, and acceleration. Let’s find out more from the characters in Eureka.

3. 3 2nd Law/Speed

4. 2 X 1 X 1 X 2 X The red ball has twice the mass of the red ball So.... if the mass is doubled, what happens to the force? ?

5. 3 X 6 X 1 X 20 X 20 X 1 X 3 X 6 X FORCE is proportional to MASS Let’s try some other masses… ? ? ?

6. 1 X 1 X 1 X 2 X What if both balls have the same mass, but the speeds are different. If the speed is doubled, what happens to the force? ? 20 km/hr 40 km/hr

7. 1 X 1 X 1 X 1 X 1 X 3 X 2 X 4 X 1 X 1 X So... FORCE is proportional to CHANGE OF SPEED.... ? 20 km/hr 20 km/hr 40 km/hr ? ? 60 km/hr 80 km/hr

8. The amount of force needed depends onmass AND change of speed Let’s sum up what we know so far… If we double mass, we ______ force If we double change of speed we ______ force double double Ready for a brain check?

9. 1. If you increase mass, what happens to force? A. increases B. decreases C. stays the same 2. If you increase speed, what happens to force? A. increases B. decreases C. stays the same

10. Let’s look at this idea of change of speed a little more… 4 Acceleration 1

11. It takes time to go from zero to the top speed, so... it’s really the “rate of change of speed” we’re talking about. The word that means “rate of change of speed” is acceleration…

12. This means we can write Newton’s 2nd Law as “force varies with mass and acceleration” The key idea of this Law can also be turned into an equation: Force = mass x acceleration (F=ma)

13. FMA Live! Fma Live 2nd Law

14. Force = mass x acceleration F = ma In an equation, changing one variable means another variable must also change. If... What happens to… F = m a F? F = m a a?

15. Let’s try some more… If... What happens to… 1. F = m a a? 2. F = m a a? 3. F = m a F? 4. F = m a a?

16. Big Soccer Ball Big soccer ball

17. Teacher in Wagon Teacher in Wagon

18. Airgun Airgun

19. Mini Bike Mini_bike

20. Slingshot Slingshot

21. Plane-Car-Motorcycle Race Plane Car Motorcycle Race

22. Extras.... More videos showing Newton’s 2nd Law

23. NFL Football Science 360 - NFL Football

24. Terry Tate Football Smash Terry Tate Football Smash

25. Newton on the ISS Newton on ISS

More Related