Laws of Motion - General Description | Physics Class 11

Physics | Notes
Laws of Motion - First, Second and Third
Class: 11

First law of motion (Law of Inertia)

According to first law of motion “Everybody in the universe continue its state of rest or of uniform motion in a straight line unless it is affected by some external unbalance force to change the state”. This law is also called the law of inertia.

a) Inertia of rest

• When a bus suddenly moves, the passengers’ falls backward, it is because the lower part of the body of the passengers in contact to the bus is in motion but upper part tends to be at rest. So, the passenger tends to fall backward.
• When we shake mango tree, the mangos fall down. It is because when we shake the tree, the mangos tend to be at rest due to inertia where as the branches are in the motion. That is why the mangos get unattached from the branches.

Second law of Motion

According to second law of motion “The rate of change in momentum of a body directly proportional to the net external force applied on it and the change in momentum takes place in the direction of force applied.

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