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Updated: 3/25/2020 This storyboard was created with StoryboardThat.com

#### Storyboard Text

• Ice has very little friction. Friction is a force, and when an object (like a ball) rolls or travels, it it pulls the opposite way on the object, causing it to slow down.
• Or, let's say I was roller-skating on grass. There would be a lot of friction that wouldn't let me move anywhere, and that would be the force I'm talking about.
• Here's Newton's second law. Here, F stands for force, m stands for mass, and a stands for acceleration.
• So, this equation helps you find the force of an object, animal, or person. All you have to do is multiply the object, animal, or person's mass by their acceleration, and you get the force.
• Newton's 2nd Law:﻿"F = ma"
• Let's calculate it's force together!
• Take this tractor for example!
• 35,000 lbs
• By using our handy-dandy scale, we now know that the tractor's mass is 35,000 lbs.
• ﻿25 miles per hour
• By driving this tractor, we now know that it's average acceleration is 25 mph.
• So, we know F = ma. In this case, m = 35,000 and a = 25. In order to calculate the force, we must multiply 35,000 by 25. When this is done, we get F = 875,000 N (N = newtons).
• a = 25 mph
• m = 35,000 lbs
• ﻿﻿F = ma
• F = 35,000 25
• F = 875,000 N