Newton's Laws of Motion
By: Abby S

Newton's First Law

An object in motion will stay in motion and an object at rest will stay at rest unless acted on by an unbalanced force.

This illustration demonstrates Newton's first law of motion because it is showing how the object with no outside forces acting upon it will never move. However the second object which is already in motion will never stop unless acted upon by an outside force.

Other elements of this law include:

~An object will not change its motion unless a force acts on it.

~An object that is not moving remains at rest until something pushes or pulls it.

~An object that is moving remains moving until something pushes or pulls it.

~All objects resist having their motion changed.

~This tendency to resist a change in motion is called inertia.

~The more mass an object has, the greater its inertia.

Newton's Second Law

The force of an object is equal to its mass times its acceleration.

The image is explaining that the more force acting upon an object, the more acceleration it will have. Although the objects are the same, since the first object has a stronger force acting upon it, its acceleration is therefore greater than the acceleration of the second object which therefore has a weaker force acting upon it.               

Other elements of this law include:

~A change in motion occurs only if a net force is exerted on an object.

~A net force changes the velocity of the object, and causes it to accelerate.

~If an object is acted upon by a net force, the change in velocity will be in the direction of the net force.

~The acceleration of an object depends on its mass.

~The more mass an object has or the more inertia it has, the harder it is to accelerate.

~More mass means less acceleration if the force acting on the objects is the same.

Newton's Third Law

For every action there is an equal and opposite reaction.

The diagram exhibits that because of the force on the object, the object hit the ground then traveled in an equal force in the opposite direction.

Other elements of this law include:

~When one object exerts a force on a second object, the second object exerts an equal force in the opposite direction on the first object.

~The force exerted by the first object is the action force.

~The force exerted by the second object is the reaction force.