Newton's Laws

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Fall 2009-Day 15
Force and Motion Activities


inertia.jpgInertia basically involves how easy or hard it is to move something and get it in motion. Emily had each student come to a table and try to push forward three different objects of the same size. One object was easy to push, the other was harder, and the third hardly budged. Although the objects had the same shape (volume), they had different weights (masses).pushingblocks.jpg

Newton's Laws

Newton's 1st Law Newton's 2nd Law Newton's 3rd Law
Emily explained that the bigger the force exerted on an object is, the bigger the acceleration will be. Also, if an object has a bigger mass, it has a slower acceleration, for the same force. To put this in to a formula, we can use Newton's 2nd Law: force=mass x acceleration.If there is no acceleration, then there must be no force; therefore, an object with no acceleration either stays at rest or keeps moving with the same speed: Newton's 1st Law.Newton's 3rd Law: for every action there is an equal and opposite reaction. We demonstrated this in class by using the two scales and pulling in opposite directions when they were attached. The same amount of Newton's (force) showed up on both of the scales.

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