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10 Newton's Laws and Nonuniform Circular Motion

# 10 Newton's Laws and Nonuniform Circular Motion - Which of...

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Which of the force diagrams below represents an object moving counterclockwise and slowing down?
You are at the fair in the vertical Loop of Death . When you are at the top of the ride, the frictional force of the track on the cart is: a) f track on cart < μ mg b) f track on cart = μ mg c) f track on cart > μ mg

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You are at the fair in the vertical Loop of Death . When you are at the top of the ride, which way does the frictional force of the track on the cart point?
You are at the fair in the vertical Loop of Death . When you are at the top of the ride, what is the magnitude of the frictional force of the track on the cart (in terms of m, g, r, and v)?

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The double wheel shown below consists of an inner wheel that spins freely on the axle and an outer wheel that spins on the inner wheel. You grab the outer wheel and spin it clockwise. Which way does the frictional force of the outer wheel on the inner wheel, f outer on inner , point?
You decide to go for a bicycle ride. On your way up Centerville Road, a) which direction does the force of friction on your front tire point?

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