The change in motion can be a change in the object's speed, direction, or both.
For example, if you push a ball with your hand, the ball will accelerate in the direction of your push. If you stop pushing the ball, it will continue to move in the same direction but at a slower speed until it eventually stops.
According to Newton's first law of motion, an object in motion will remain in motion with the same speed and in the same direction unless acted upon by unbalanced force.
When an unbalanced force is applied to an object, Newton's second law of motion states that the object's acceleration will be directly proportional to the net force applied to the object, and inversely proportional to the mass of the object.
If F represents the net force acting on an object of mass m, and a represents the object's acceleration, then the second law can be expressed as:
F = ma
The unit of force is the newton (N), which is equal to the force required to accelerate a mass of one kilogram by one meter per second squared.
