Laws Of Motion
- The property of a body to resist any change is called inertia e. g. when a horse starts suddenly, the rider falls backwards due to the inertia of rest of the upper part of his body.
Newton’s First Law
- Every body continues to be in its state of rest or uniform motion in a straight line, unless compelled by some external force acting on it.
- Example: Any object continues lying where it is, unless it is moved.
- Newton’s first law gives the definition of Inertia.
- Momentum of a body is the product of its mass, m and velocity, v, and is denoted by P.
It is a vector quantity.
- SI unit → kg ms−1
Newton’s Second Law of Motion
- The rate of change of linear momentum of a body is directly proportional to the external force applied on the body, and this change takes place always in the direction of force applied.
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