Which of the following is NOT an example of balanced force?

Gravitaional force due to which table is steady on ground

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Two persons pushing box with same force in opposite direction

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See saw moving up and down

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None of the above

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Solution

The correct option is D See saw moving up and down
'See saw' moving up and down is due to the unbalanced force, as it tilts down in one side, it means that force acting on that side is more and opposite side is less. An unbalanced force brings change in the state of motion or in state of rest of object,it is the cause of motion in object.
Box pushed from both direction with same force, so the net force is zero. Hence no movement is seen here. In other case table is also steady that means forces are balanced.

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Neha is pushing a box having wheels with a force of 40N. Prashant joins in and starts pushing the box with a force of same magnitude and in the same direction.

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b) which type of force will be exerted on the wheels while the box is pushed?

c) What will happen to the motion of the box if Prashant exerts force of lesser magnitude and in the direction opposite to that of Neha?

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