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012 Phys211 S10 Friction

# 012 Phys211 S10 Friction - 1 Friction Phys211 Spring 2010...

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2/8/2010 1 Friction Phys211 Spring 2010 2/10/10 Essential University Physics, J. Wolfson 1 2/10/10 Friction Kinetic Friction Sliding object A force that slows down an object Static Friction Not yet sliding A force that prevents an object from beginning to move N f k k N f s s Essential University Physics, J. Wolfson 2/10/10 Sliding block, Q1 A block is sliding to the right on a horizontal surface, being pushed to the right as it slides. Weight=10N Friction coefficients: s =0.60, k =0.50 Currently: speed=2.0m/s, push=3.0N What is the magnitude of friction on the block? A. 1.0N B. 3.0N C. 5.0N D. 6.0N E. 7.0N Essential University Physics, J. Wolfson

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2/8/2010 2 2/10/10 Setting block, Q2 A block is setting on a horizontal surface, being pushed gently to the right. Weight=10N Friction coefficients: s =0.60, k =0.50 Currently: speed=0, push=3.0N What is the magnitude of friction on the block? A. 1.0N B. 3.0N C. 5.0N D. 6.0N E. 7.0N Essential University Physics, J. Wolfson 2/10/10 Setting block, Q3 A block is setting on a horizontal surface, being pushed hard to the right.
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