N5_presentation

# N5_presentation - Ceiling Wall String String Suppose the...

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Ceiling Wall String String Suppose the block has a mass of 2-kg and the upper string makes a 30 º angle with the vertical. What are the tensions in the two strings? g F 1 T F 2 T F N 6 . 19 = = mg F g N 6 . 22 cos30 N 6 . 19 30 cos 2 2 = ° = = ° T g T F F F N 3 . 11 sin30 N 6 . 22 30 sin 2 1 = ° = ° = T T F F ° 30

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For an extended object in “static equilibrium”, two conditions must be satisfied: (1) the net force on the object must be zero (2) the net torque (about any point) on the object must be zero.
A person weighing 600 N stands 1.0-meter from a 4-m-long plank of mass 20-kg. The plank is supported by two wooden blocks placed 0.5-m from each end of the plank. What is the magnitude of the force exerted by each block? block 1 block 2 1 N F 2 N F Np F g F

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(N5T.5) A board of mass m lays on the ground. What is the magnitude of the force that you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)? (A) 2mg (B) mg (C) ½ mg (D) it depends on the length of the board. (E) Other. Explain: __________
F 2 F 2 F F 1 4 5 6 Rank order the torques about the hinge, from the smallest torque to the largest

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## This note was uploaded on 04/17/2008 for the course PHYS 120 taught by Professor Decarlo during the Spring '08 term at DePauw.

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N5_presentation - Ceiling Wall String String Suppose the...

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