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2014-08-18T19:56:08+05:30

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Let us take an example of the engine which is at he front of a train.

The engine of a train gets a force F1 in forward direction from steam or coal burning or electricity. There is a frictional force F2 acting on the engine at the wheels in the backward direction. The coach behind engine pulls the engine with a force F3.  Then there is a normal reaction force N acting upwards by the surface of earth through the rails.  There is the weight W of the engine acting downwards from the center of mass of engine.

The net force is sum of these forces.

  F1 - F2 - F3 = net force on engine that makes it move forward = mass *
                                                                     acceleration

  W - N = 0  is the resultant net force. so train does not move upwards.
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A glass is placed on surface of an open water tank. The glass has a weight W that pulls it downward.  The water exerts a buoyancy force B upwards on glass. The glass moves downwards with some acceleration.

Net force on glass =  F = W - B 

Buoyancy force =
           W [density of water * volume of glass / density of glass * volume of glass]

So netforce    F     =  W [  density of glass - density of water ] / density of glass

 This net force = mass of glass * its acceleration

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2014-08-19T18:23:45+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
A book kept on a table where the book exerts vertical pressure on the table for its weight and the table exerts pressure from below so the force gets cancelled.

In a game of tug of war when one team pulls one side and the other team the other side then the force applied by both gets cancelled.
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