Why is it easier to open a door by applying the force at the free end of it.

A block of mass m is pulled by a uniform chain of mass m tied to it by applying a force F at the other end of the chain.The tension at a point P which is at a distance of quarter of the length of the chain from the free end,will be

Why is it easier to swim in sea water than in fresh water?

Why is it easier to push a heavy block from behind than to press it on the top and push?

(A) : It is harder to open and shut the door if we apply force near the hinge. (R ) : Torque due to a given force is maximum at hinge of the door.

A mechanic can open a nut by applying a force of 150N while using a lever handle of length 40cm. How long a handle is required if he wants to open it by applying a force of only 50 N?

Two springs A and B (k_A=2k_B) are stretched by applying forces of equal magnitudes at the force ends. If the energy stored in A is E, that in B is

The length of an iron wire is L and area of cross-section is A. The increase in length is l on applying the force F on its two ends. Which of the statement is correct

A door 1.6 m wide requires a force of 1 N to be applied at the free end to open or close it. The force that is required at a point 0.4 m distant from the hinges for opening or closing the door is

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, the force exerted by the rope on the block is