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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

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## Newton’s 2 nd Law

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**Newton’s**2nd 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.**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? ?**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… ? ? ?**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**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**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?**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**Let’s look at this idea of change of speed a little**more… 4 Acceleration 1**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…**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)**FMA Live!**Fma Live 2nd Law**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?**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?**Big Soccer Ball**Big soccer ball**Teacher in Wagon**Teacher in Wagon**Airgun**Airgun**Mini Bike**Mini_bike**Slingshot**Slingshot**Plane-Car-Motorcycle Race**Plane Car Motorcycle Race**Extras....**More videos showing Newton’s 2nd Law**NFL Football**Science 360 - NFL Football**Terry Tate Football Smash**Terry Tate Football Smash**Newton on the ISS**Newton on ISS

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