Question

what is the first law of motion? give an example.

Answer 1

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☞ Newton’s first law states that a body remains in the state of rest or uniform motion in a straight line until an external force acts on it.

$\huge \blue {Example}$

☞ The motion of a ball falling down is an example of Newton's first law.

☞ The motion of an airplane when the pilot changes the throttle setting of the engine is also an example of Newton's first law.

Answer 2

❒ Based on Galileo's observation od the nature of state of the body, Newton formulated some laws of motion. These laws are known as Newton's laws of motion.

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Every body remains in the state of rest or uniform motion in any direction (straight line) unless and until compelled by any external unbalanced force. So, we can say that,

• An external force is required to acclerate or to move a body. This force should be Unbalanced such that net force is not equals to 0.
• It explains the Inertia that is the tendency of a body to continies its state of rest or uniform motion.

➤ Depending upon the State of change, Inertia is of three types, That are:

• Inertia of Rest: It is the tendency of the body to remain in the stste of rest unless an external unbalanced force acts on it.

Example:- When a vechile starts suddenly, we fall backward because our foot is in contact with the vevjile which started suddenly, but our upper body is maintaining its state of rest.

• Inertia of motion: It is the tendency of the body to continue its state of motion until and unless compelled by any external Unbalanced force.

Example:- When vehicle stops suddenly, we fall forward because of the same reason as above. Our upper body is maintaining the state of motion.

• Inertia of Direction: It is the tendency of a body to keep its direction same along the same straight line unless and until compelled by an external Unbalanced force.

Example:- We are pushed towards right or left and it seems that we are falling when the vehicle takes a sharp turn. Here, the body is trying to maintain its direction.

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Mass and Inertia:

A larger force is required to move a heavier box than a lighter box. Here, force depends on Inertia and hence Inertia depends on the mass of the body. A body has greater mass, has greater inertia.

• Mass is the measure of Inertia.

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