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PHC4Worksheet-1 Skeleton

# PHC4Worksheet-1 Skeleton - v v v v f = vo at 2 v 2 = vo 2ax...

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( 29 2 2 2 2 1 1 1 2 2 2 2 f o o f f o f o fs s N fk k N v v at x v t at x v t at x v v t v v ax F ma F F F F μ μ = + = + = - = + = + = = v v v v v v v v v v v v v r A 20-kg block is connected by a string over a pulley to a 10-kg box, as shown at right. The string and pulley are massless. The pulley is also frictionless. The friction coefficient between the horizontal surface and the block is 0.4 (static) and 0.3 (kinetic). The system is released from rest. 17) What is the tension in the rope before you release the block? Answer: 98 N 18) What is the maximum possible friction force that can be exerted on the block? Answer: 78.4 19) Will the block move? Explain how you know. Answer: Yes; m box g > μ s F N 20) If the block is moving, what is the tension in the string? Answer: 84.9 N 21) What is the acceleration of the block? Answer: 1.31 m/s 2 [R] 22) What is the net force acting on the box? Answer: 13.1 N [D]

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( 29 2 2 2 2 1 1 1 2 2 2 2 f o o f f o f o fs s N fk k N v v at x v t at x v t at x v v t v v ax F ma F F F F μ μ = + = + = - = + = + = = v v v v v v v v v v v v v r A 20-kg block is connected by a string over a pulley to a 10-kg box, as shown at right. The string and pulley are massless. The pulley is also frictionless. The friction coefficient between the inclined surface and the block is 0.4 (static) and 0.3 (kinetic). The incline makes an angle of 40º to the horizontal. The system is released from rest. 23) What normal force acts on the block? Answer: 1.50 x 10 2 N [U40ºL] 24) What force does gravity exert on the block parallel to the incline?
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