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ef152-lec-2-5

# ef152-lec-2-5 - Module 2 Lecture 5 Review What condition(s...

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EF 152 Spring, 2009 Lecture 2-5 1 Module 2, Lecture 5: Review What condition(s) are necessary for rotational equilibrium? A. Σ F = 0 B. Σ τ = 0 C. Σ F = 0 and Σ τ = 0 A nonzero net torque will: A. create a change in ω B. maintain a constant ω C. cause linear acceleration D. maintain constant angular momentum A heavy seesaw is out of balance. A lightweight girl sits on the end that is tilted downwards. A heavy boy sits on the other end and the seesaw now balances. If the boy and girl move forward so that they are one-half their original distance from the pivot point, what will happen to the seesaw? A. the side the boy is sitting on will tilt downward B. the side the girl is sitting on will tilt downward C. nothing, the seesaw will remain balanced D. more information (masses and distances) are needed EF 152 Spring, 2009 Lecture 2-5 2 A force is applied to the end of a 2-m long uniform board weighing 50 N in order to keep it in equilibrium. Determine the magnitude of the horizontal component of the wall force.

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