# The three laws of Newton

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Sebastian Soto #304

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• Ouch! Mmm wait a minute..﻿.
• How did that apple fall down??...﻿
• I have a theory!
• ﻿Maybe the apple is accelerated, since its velocity changes from zero as it is hanging on the tree and moves toward the ground.
• That means that something acts on the apple to cause this acceleration. Let's call this "gravity",﻿
• ﻿I am gonna called net force
• Something is ﻿acting on that horse that is causing the acceleration of that carriage...
• I have another theory
• The velocity of an object changes when it is subjected to an external force. This defines a force to be equal to change in momentum per change in time.
• ﻿Well i guess that for every action, there is an equal and opposite reaction.
• What if ﻿a ball rolling down a hill will continue to roll unless friction or another force stops it.
• Hmm i want to do an experiment i had in mind a long time ago
• I will call this inertia. The key point here is that if there is no net force acting on an object then the object will maintain a constant velocity.
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