008 Phys211 S10 First Two Laws

# 008 Phys211 S10 First Two Laws - 1/27/2010 1 First Two Laws...

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1/27/2010 1 First Two Laws Phys211 Spring 2010 2/02/10 Essential University Physics, J. Wolfson 1 Inertia, Q1 Net force causes acceleration Q: If the net force on an object is zero, then the velocity of that object _______. A. is zero. B. is constant, but not necessarily zero. C. has a constant magnitude, but direction can change. 2/02/10 Essential University Physics, J. Wolfson Question 2 A cart is at rest on the track The wheels are frictionless. Each student tries to identify the number of forces felt by the cart. Which student is correct? A lice says there are 3 forces. Gravity pulls straight down. To keep it from crashing through, the track pushes on the cart. To keep it from rolling, the cable pulls on the cart. B ob says all possible motion is along the track. There are only two forces, cable up the track and gravity down the ramp. C arla says the only thing actually pulling on the cart is gravity. The rest is just geometry. There is only one force. D

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## This note was uploaded on 10/31/2010 for the course PHYS 211 taught by Professor Melendorf during the Spring '10 term at Illinois Central.

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008 Phys211 S10 First Two Laws - 1/27/2010 1 First Two Laws...

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