week3-1

# week3-1 - Where to aim in order to Hit the Falling...

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Where to aim in order to Hit the Falling object (ignore air friction)? Ignoring friction y = v 0y t – 1/2gt 2 t = x/v 0x , v 0y /v 0x = h/x y = h – 1/2gt 2 In the same time the monkey falls 1/2gt 2 , i.e. for the monkey: y = h – 1/2gt 2 So the bullet always hits the monkey no matter what the value of v 0 x y

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Some Facts about the Motion? To move a heavy chair, you need to push and apply Force . After you stop pushing, the chair stops. After a gentle push, the kid start to move He will continue moving without being pushed any further.
A bit of history: Aristotle’s View on the Cause of Motion A force is needed to keep an object moving. Air rushing around a thrown object continues to push the object forward.

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A bit of history: Galileo’s Contribution Galileo challenged Aristotle’s ideas that had been widely accepted for many centuries. He argued that the natural tendency of a moving object is to continue moving. No force is needed to keep an object moving This goes against what we seem to experience.
A bit of history: Newton’s Contribution Newton built on Galileo’s work, expanding it. He developed a comprehensive theory of motion that replaced Aristotle’s ideas. Newton’s theory is still widely used to explain ordinary motions.

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