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Newton's Laws of Motion

by: Karen Weaver

Newton's three laws of motion:

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

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

3. For every action there is an equal and opposite reaction

Newton's First Law of Motion

In the picture above there is a drop on a roller coaster. The motion of the person won't change until the drop because no other outside force is acting upon it. Once the person riding in the cart comes along the drop their motion changes due to new unbalanced forces acting upon it. This causes the person's position to change. Although the person did move there is always resistance against the force. The more mass an object has, the more resistance or inertia it has.

Newton's Second Law of Motion

As is clearly sown above, two objects are getting pushed with the same force as one another but the marshmallow travels much farther. The reason for this is the car has much more mass then the marshmallow. The more mass on object has, the harder it is to move. More mass means less acceleration if the force acting on the objects is the same. A change in motion can only occur if a net force is being exerted on the object (such as the marshmallow or the car).

Newton's Third Law of Motion

When you ride a skateboard it is obvious that you are exerting a force on the ground but did you know the ground is also exerting a force against you. If this didn't occur you couldn't move forward. The forces being exerted against one another are always equal. In these situations there is an action force and a reaction force. In this case the action force is you pushing off the ground and the reaction for is the ground pushing off you. This is the reaction started from the action of the push form the leg. For every action there is an equal and opposite reaction.