Types of Forces

Consider the following statements about the four fundamental forces in nature.
(i) The strong nuclear force binds protons and neutrons in a nucleus.
(ii) The strong nuclear force is about ${10}^3$ times the electromagnetic force in strength.
(iii) The weak nuclear force is the weakest of all the four fundamental forces.
(iv) The range of the weak nuclear is about ${10}^{-16} \mathrm{m}$
The correct statement(s) is (are)

The forces between electric charges in relative motion are called __________.

When a block is kept on the table, its weight acts vertically downwards then the force exerted by the surface on the block is

Out of the following which is NOT a friction?

When two surfaces are coated with lubricant, friction between the surfaces ______.

When one body tends to move or move over the another body, the opposition force depends upon_________.

Under the action of variable force, at any instant the displacement is

Which of the following is the correct order of forces?

Ten one-rupee coins are put on top of each other on a table. Each coin has a mass m. Which statement of the following is not true?

Consider the following pair of forces of equal magnitude and opposite directions:

(P) Gravitational forces exerted on each other by two-point masses separated by a distance.

(Q) A couple of forces used to rotate a water tap.

(R) Gravitational force and normal force experienced by an object kept on a table.

For which of these pair/pairs the two forces do NOT cancel each other's translational effect?

A $60 \mathrm{kg}$ man pushes a $40 \mathrm{kg}$ man, by a force of $60 \mathrm{N}$. The $40 \mathrm{kg}$ man has pushed the other man with a force of 

Let $E$, $G$ and $N$ represent the magnitudes of electromagnetic, gravitational and nuclear forces between two electrons at a given separation.

When Neils Bohr shook hand with Werner Heisenberg, what kind of force they exerted?

Assertion: All electric and magnetic phenomena are governed by the basic laws of electromagnetism
Reason: The attempts to unify fundamental forces of nature reflect the quest for unification.  

Match the following (Take the relative strength of the strongest fundamental forces in nature as one)