what are the examples of the net forces give some of them
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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
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.
======================================================
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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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.
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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