Forces and Laws of Motion Test - 6

Since the body is accelerating it means that a force acting on the body is changing the velocity of the body. Since there is no change in direction the speed is also changing. And mass always remains constant.

When a moving bus at high speed suddenly stops, the passenger feels jerk in forward direction due to inertia of motion, that tends to keep the moving passenger to continue moving. 

The weight of the body is the measure of force by which object is attracted towards the centre of earth. It always acts vertically downwards.

If a branch of a tree is vigorously shaken, some of the leaves may get detached from tree due to inertia of rest. The leaves tend to remain in rest but branches come in motion.

Inertia is the property of a body by virtue of which the body is unable to change the state of rest or state of motion and direction as inertia is the tendency to oppose the change in state or direction.

Inertia of the body is proportional to the mass of the body. 5Rs coin is heavier than 5Rs note and 1Rs coins. So, inertia of 5Rs coin more than others.

A high jumper runs for a while before taking high jump so that the inertia of motion help him in taking a higher jump. 

The inertia of the body is proportional to mass of the body. So, body P with masses 10 kg will have more inertia in comparison to body Q of mass 5 kg.

The football being hollow has lesser mass when compared to a stone and inertia is directly proportional to the mass of the object. Therefore stone has greater interia. 

Dust can be removed from a hanging carpet by shaking it or beating it with a stick. Initially, both the carpet and the dust are at rest. When the carpet is shaken or beaten with a stick, the carpets is set into motion while the dust remains in the state of rest due to the inertia of rest. Thus the dust falls down due to the pull of gravity.