An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force
Newton's First Law
The behaviour of all objects can be described by saying that objects tend to "keep on doing what they're doing" (unless acted upon by an unbalancedforce)
Newton's First Law
All objects resist changes in their state of motion - they tend to "keep on doing what they're doing." This resistance is called inertia. The more inertia, the higher the mass of the object.
Newton's First Law
This is due to inertia of rest: when the bus suddenly starts, the lower part of the body of the passenger which is in contact with the bus moves along with the bus while the upper part of the body tends to retain its state of rest due to inertia. As a result, the passenger falls backward.
