9. Exercises

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===Exercise 9.4===
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A block, of mass 4 kg, is being dragged across a rough horizontal surface at a constant velocity by a force of 20 N acting parallel to the surface. Find the coefficient of friction between the object and the surface.
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Revision as of 15:29, 14 September 2009

       Theory          Exercises      

Exercise 9.1

A parachutist is falling vertically at a constant speed. He has mass 80 kg. Find the magnitude of the upward force acting on the parachute.


Exercise 9.2

Each of the bodies shown below are moving with a constant velocity. Use this to find P and Q.

Image:E9.2.GIF


Exercise 9.3

A bicycle moves with a constant velocity along a straight horizontal road. If the forward force which the cyclist exerts by pedalling is 28 N, what is the magnitude of the resistive force acting on the bicycle and cyclist ?


Exercise 9.4

A block, of mass 4 kg, is being dragged across a rough horizontal surface at a constant velocity by a force of 20 N acting parallel to the surface. Find the coefficient of friction between the object and the surface.