7. A stonemason drags a marble block across a floor by pulling on a rope attached to the block. The block is in equilibrium. How are the various forces related? What are the action-reaction pair? not necessarily
7. A stonemason drags a marble block across a floor by pulling on a rope attached to the block. The block is in equilibrium. How are the various forces related? What are the action-reaction pair? not necessarily
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Transcribed Image Text:7. A stonemason drags a marble block across a floor by pulling on a rope attached to the block. The block is
not necessarily in equilibrium. How are the various forces related? What are the action-reaction pair?
8. You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230
N horizontal force. Once the crate "break loose" and starts to move, you can keep it moving at constant
velocity with only 200 N. What are the coefficients of static and kinetic
friction?
9. A small car with mass 0.800 kg travels at constant speed on the inside of a
track that is a vertical circle with radius 5.00 m (Fig. E5.42). If the normal
force exerted by the track on the car when it is at the top of the track (point
B) is 6.00 N, what is the normal force on the car when it is at the bottom of
the track (point A)?
v-12.0 m/s
5.00 m
v 12.0 m/s
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