Newton’s First Law By Amanda Stevens Physical Science 5 th Period.

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Presentation transcript:

Newton’s First Law By Amanda Stevens Physical Science 5 th Period

The History of Newton’s Laws Sir Isaac Newton described the relationship between motion and force in the laws that we now call Newton’s laws of motion. Sir Isaac Newton described the relationship between motion and force in the laws that we now call Newton’s laws of motion. His laws apply to a wide range of motion like a caterpillar crawling on a leaf, a person riding a bicycle, or a rocket blasting off into space. His laws apply to a wide range of motion like a caterpillar crawling on a leaf, a person riding a bicycle, or a rocket blasting off into space.

First Law An object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force. An object at rest remains at rest and an object in motion maintains its velocity unless it experiences an unbalanced force.

Objects Tend to Maintain Their State of Motion. Inertia-the tendency of an object to resist being moved or, if the object is moving, to resist a change in speed or direction until an outside force acts on the object.

Inertia Is Related to an Object’s Mass Matter resists any change in motion. An object will remain at rest until something makes it move. Mass is a measure of inertia. An object with a small mass has less inertia than an object with a large mass.

Seatbelts Provide Protection Because of inertia, you slide toward the side of a car when it makes a sharp turn. Because of inertia, you slide toward the side of a car when it makes a sharp turn. Inertia is also the reason why cars, planes, and bicycles cannot come to a complete stop instantly. Inertia is also the reason why cars, planes, and bicycles cannot come to a complete stop instantly. When your car is coming to a stop, your seat belt and the friction between you and the seat stop your forward motion. When your car is coming to a stop, your seat belt and the friction between you and the seat stop your forward motion. They provide unbalanced rearward forces needed to bring you to a stop as the car stops. They provide unbalanced rearward forces needed to bring you to a stop as the car stops.

That’s why babies are placed in a backward-facing car seat. The force that is needed to bring the baby to a stop is safely spread out over the baby’s entire body.

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