# lect541 - What do you remember from Physics 53 Review Three...

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What do you remember from Physics 53?

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Review
Three Newton’s Laws

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Newton’s Law of Universal Gravitation Every particle in universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between them. This force acts along the line joining the two particles. F = G m 1 m 2 /r 2
The Universal Gravitational Constant G F = Gm 1 m 2 /d 2 G = 6.67 10 -11 Nm 2 /kg

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Questions 1. Consider an apple at the top of the tree that is pulled by Earth’s gravity with a force of 1 N. If the tree were twice as tall, would the force of gravity be only ¼ as strong? Defend your answer.
Momentum When we combine the ideas of inertia and motion we are dealing with momentum

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Impulse Impulse = Force x Time interval
Assume that your friend jumps from the roof of the garage and lands on the ground. How will the impulses the ground exerts on your friend compare if the landing is on grass or on concrete?

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Conservation of Momentum To change a momentum we must apply some impulse… In other words, the force or impulse must be exerted on the object or any system of objects by something external to the object.
1. How does the padding (or air pockets) in the soles of running shoes reduce the forces on your legs? Explain your answer in terms of impulse and momentum.

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