Two persons manage to push a motorcar of mass 1200 kg at a uniform velocity along a level road. The motorcar can be pushed by three persons to produce an acceleration of 0.2 m s 2. With what force does each person push the motorcar (Assume that all persons push the motorcar with the same muscular effort).

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Solution

First,
There is uniform velocity. This means no acceleration. This means net force will be zero (according to first law)
So, the applied force = Friction Force
F + F = f
2F = f
In second case
F+F+F -f = m a
3F- 2F = 1200 x 0.2
F = 240 N

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First, There is uniform velocity. This means no acceleration. This means net force will be zero (according to first law) So, the applied force = Friction Force F + F = f 2F = f In second case F+F+F -f = m a 3F- 2F = 1200 x 0.2 F = 240 N

First,
There is uniform velocity. This means no acceleration. This means net force will be zero (according to first law)
So, the applied force = Friction Force
F + F = f
2F = f
In second case
F+F+F -f = m a
3F- 2F = 1200 x 0.2
F = 240 N