Physics
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According to Newton's first law... An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This law is often called "the law of inertia".
Photo by *nacnud*
An example will be one's body movement to the side when a car makes a sharp turn. Tightening of seat belts in a car when it stops quickly.
Photo by Alessio Lin
Another example will be when we kick a ball.
The ball will continue to roll unless there is something to stop it, for example a brick wall.
Photo by Peter Glaser
According to Newton's second law...
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Photo by *nacnud*
However, the Second Law gives us an exact relationship between force, mass, and acceleration. It can be expressed as a mathematical equation:
FORCE = MASS times ACCELERATION
Photo by *nacnud*
If you use the same force to push a truck and push a car, the car will have more acceleration than the truck, because the car has less mass.
Another example will be that when pushing a box, we will need a certain amount of force in order for the both to move.
According to Newton's third law...
For every action there is an equal and opposite re-action.
Photo by *nacnud*
For Example: When the rocket's action is to push down on the ground with the force of its powerful engines, and the reaction is that the ground pushes the rocket upwards with an equal force.
Photo by SpaceX
Another example will be when you jump off a small rowing boat into water, you will push yourself forward towards the water.
Photo by George Kourounis
