Newton’s First Law of Motion

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Newton’s First Law of Motion

First we need to define the word FORCE: The cause of motion (what causes objects to move) Two types of forces Pushes Pulls Slide from www.science-class.net

Forces may be balanced or unbalanced Balanced forces – all forces acting on an object are equal There is NO MOTION Unbalanced forces – one or more forces acting on an object are stronger than others There is MOTION A NET FORCE

Objects at Rest Objects at rest tend to stay at rest unless acted upon by a force. [push or pull] Newton described this tendency as inertia. Inertia can be described as the tendency of an object to keep doing whatever’s it’s doing.

Which vehicle has more inertia? Mass & Inertia Mass is the amount of matter in an object. The more MASS an object has, the more INERTIA the object has. Bigger objects are harder to start & stop Which vehicle has more inertia? Slide from www.science-class.net

What about objects that are already in motion? Newton stated that objects in motion tend to stay in motion until acted upon by a force (or hits it.)

Newton’s 1st Law (also known as the law of inertia) A moving object moves in a straight line with constant speed unless a force acts on it. The tendency of an object at rest to remain at rest and an object in motion to remain in motion unless acted upon by an unbalanced force. Objects do not change their motion unless a force acts on them

The truck is in motion. What is the force that causes it to stop? The push of the stopped car. The car is at rest. What is the force that causes it to move? The push of the truck. Slide from www.science-class.net