Force and Pressure

A body if at state of rest starts moving only when force is applied (first law of motion).

Rubbing gives rise to the generation of static electric charges hence electric force.

Any force which involves the motion of our body is muscular force.

In liquids, the pressure increases with depth because then the total pressure is the atmospheric pressure plus the pressure due to the liquid present above.

Gravitational force is acting on all bodies containing mass.

If the direction or the magnitude or both change, its effect will always change.

Any moving body comes to rest due to the action of frictional force if other external forces are absent.

A force is a vector quantity therefore it has both direction as well as magnitude.

A force when applied to an inflated balloon deforms it, hence it is an example of deforming force.

A moving body increases speed if a force parallel to motion is applied.

The product of mass and velocity is called momentum.

The tendency of a body to maintain its state of rest or uniform motion is called Inertia.

Force = mxg where g=9.8 N/Kg hence mass= 1 Kgwt .

Like poles always repel and unlike poles always attract.

Pressure is force per unit area.

The piece of cloth is to increase the surface area which in turn decreases the pressure.

Only muscular force is a contact force, rest all can act at a distance of separation.

The friction is the greatest on a doormat as it is the most rough.

A tiny iron filling can be removed by magnetic force because Iron is ferromagnetic in nature.

The atmospheric pressure decreases with height because of decreasing amount of air present above the level.