If two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces.

We make use of the relation between force, area and pressure to our advantage in many situations. To walk over a muddy patch of wet kachcha road without slipping, a wooden plank is used, the foundation is made wider than the width of the wall to be erected on it, width of tyres used for heavy vehicles like trucks and buses is larger than those used in cars or bicycles. On the other hand, tools meant for cutting and piercing always have a sharp edge. This ensures that the area of their surfaces in contact with the material to be cut pierced is as small as possible.

By doing this they increase the area of contact of the load with their head. So, the pressure on their head is reduced and they find it easier it to carry the load.

Friction does affect the motion of object moving through air. However, the force of friction due to air is very small when compared to the force 01 friction between solid surfaces, or between liquids. Therefore, the effect of friction due to air is generally not noticeable.

If two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. If the magnitude of the two forces in opposite directions is equal then net force will be zero.

A person who is in a space station too far away from earth for gravitational force to act on him, will not suffer any gravitational force.

As, the magnet will attract the paper clips, so the force acting on them will be towards the magnet.

Due to greater of large tyres, then will suffer less pressure, so the chance of tyre burst gets reduced.

No, we cannot lift or push a book lying on a table without touching it because it is a type of contact forces.

No, on the application of force, the shape of a body may also change as well as speed.

SI unit of pressure is N / m² or pascal.

When the air is pumped into the tubes, then the tubes get inflated due to the pressure of air on the walls of the tube.

Due to broad feet of camels, they usually exert less pressure in the sand, so camels sinks less in the sand.

The upward force will be greater than the force of gravity, only then the balloon will be able to lift up against this force.

It is the force of gravity which is responsible for the grains to fall down. 

When a force is applied on an Object, then the shape of object changes with the application of force.

There are two states of motion:
(i) State of rest
(ii) State of motion.

The electrostatic force starts working between the cloth made of synthetic fibre and sticks to skin.

Yes, when we place our palm in front of a moving ball, then the palm apply a force on the moving ball and stop it.

In 'tug of war', when two teams pull equally hard, then the rope does not move in any direction.