PHYSICS [2 Mark Question Answer]

We always prefer to land on sand instead of hard floor while taking a high jump because sand increases the time of contact.
As FX t = m ( v - u ) and our change in momentum is constant so if time increases then force experienced would decrease.

Yes, it is true that apple attracts the earth towards it with same force but the mass of the earth is so huge that acceleration produced in it due to this force is very much small and negligible to notice

Yes, the force of gravitation of earth affects the motion of the moon, because the moon is revolving around the earth and centripetal force for this revolution is provided by earth's gravitation.

Yes, we have a gravitational force of attraction between us and a book. But our mass is very small so the force between us and the book is very small almost negligible.

Person will weigh more at Delhi as we know that gravity decreases with increase in height. Now as Shimla is at a height from Delhi so weight is less in Shimla and more in Delhi.

Gravity is the force of attraction between the object and the earth whereas gravitation refers to the force of attraction that exists between any two bodies that possess mass.

Every object in the universe attracts every other object with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
The Law of gravitation is called universal because it applies to all bodies of the universe.

It is advantageous to run before taking a long jump because after running we get motion of inertia which helps in long jumping

According to Newton's first law of motion, if a body is in a state of rest, it will remain in the state of rest, and if the body is in the state of motion, it will remain moving in the same direction with the same speed unless an external force is applied on it.

Linear Momentum is defined as the amount of motion contained in a body. It is given by the product of the mass of the body and its velocity.

A ball rolling on the ground will continue to roll unless the external force , the force of friction between the ball and the ground stops it.This is an example of inertia of motion.

A book lying on a table will remain placed on table unless it is displaced by some external force. This is an example of inertia of rest.

When a body is at rest , it will continue to remain at rest unless some external force is applied to change its state of rest. This property of body is called inertia of rest.

Gravity is the force of attraction between the object and the earth whereas gravitation refers to the force of attraction that exists between any two bodies that possess mass.

Because the masses of persons are not large enough to overcome the value of small constant of gravitation so the force of gravitation is very small and negligible to feel.

Action is equal and opposite to reaction but they act on different bodies and object moves as movement requires an unbalanced force and these are provided once the inertia is overcome.

When we shake the branches of a tree, the fruits and leaves remain in state of rest while branches comes in rest so fruits and leaves are detached from the tree.

Passengers tend to fall in backward direction when the bus starts suddenly because due to their inertia of rest, as soon as the bus starts, their lower body comes in motion but the upper body continues to be in the state of rest.

Passengers are thrown in the forward direction as the running bus stops suddenly because due to their inertia of motion, their upper body continues to be in the state of motion even though the lowerbody comes to rest when the bus stops.

According to Newton's third law of motion, to every action there is always an equal and opposite reaction. The action and reaction act simultaneously on two different bodies.

The property by which a body neither changes its present state of rest or of uniform motion in a straight line nor tends to change the present state, is known as inertia.

Momentum is defined as the amount of motion contained in the body. It is given by the product of the mass of the body and its velocity.