Newtons first law of motion states that an object at rest will remain at rest and an object in motion stays in motion unless acted upon by another force. A simple statement of Newtons first law of motion is that if an object is not moving it wont move unless a nonzero net force acts on it. If an object is moving it will continue at a constant velocity until a net force acts to change its speed or direction. If there is a net force acting on an object it will accelerate.
Resistance to change is called inertia. If you are riding in a moving car you are moving at the same speed the car is moving. When brakes apply force to the car the car decelerates. The brakes did not apply a force to you so inertia keeps you moving forward at the same speed and direction you were going before the car decelerated. A force such as the seat belt is needed to pull you back. The more massive an object is the greater inertia it has.
Newtons second law of motion states that size and direction of a net force equals mass times acceleration or net force= Mass x Acceleration
Newtons third law of motion states that if one object exerts a force on another object then the second object exerts a force of equal strength in the opposite direction. For action there is an equal but opposite reaction.
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