9. Exercises
From Mechanics
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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.
Answer
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Solution
Exercise 9.2
Each of the bodies shown below are moving with a constant velocity. Use this to find P and Q.
Answer a
Answer b
Answer c
Solution a
Solution b
Solution c
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 ?
Answer
Solution
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.
Answer
Solution
