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Newton's Laws of Motion

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Transcript of Newton's Laws of Motion

Newton's Laws of Motion
Betsy Olson
Period 2
Physics
11/16/2013

Newton's First Law
When something is moving, it will keep moving unless something stops it. When something is not moving, it will not move until something from outside it pushes it.

In this video, the dominoes are not moving until the finger pushes one domino. The rest of the dominoes still aren't moving until the next domino touches each one. Finally, the ground stops each domino from moving after it falls.

Newton's Second Law
In order for something to accelerate, a force has to push or pull on it. The greater the mass of the thing being pushed, the greater the force needed.

In this picture, the snowball accelerated because the woman's hand pushed on it. It wasn't a very large snowball, so it didn't require much force to accelerate.

Photo by Erika Sitton
Newton's Third Law
All "actions" have "reactions" that are equal and opposite.

The hand pulling on the rope has an equal and opposite force pulling back on it.

Photo from Olson family

Lab Idea
Let's test Newton's Second Law: the greater the mass, the greater the force needed to accelerate it
Get an air-filled balloon, a bouncy ball, and a basketball. Hold each type of ball in one palm, and lightly push on it with a finger from your other hand. Which ball accelerates the easiest?
We'd expect the balloon to accelerate most and the basketball to accelerate least.
Full transcript
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