Inertia - Newton’s First Law

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Presentation transcript:

Inertia - Newton’s First Law Lesson 3: Inertia - Newton’s First Law

Newton’s First Law of Motion Objects at rest will stay at rest, and objects in motion will stay in motion, unless they are acted on by an outside force. This scientific law is also known as the Law of Inertia.

Inertia is an object’s resistance to any change in its state of motion.

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Discovery Education Video Science Video Vocab: Inertia

What outside forces affect the motion of objects on earth? 1. Gravity 2. Friction

Gravity is a force that exists between any two objects that have mass. Earth’s gravity pulls objects toward the center of earth. Earth’s gravity pulls objects with a force of 9.8 meters per second squared.

Friction is a force that opposes the motion of a body across a surface or through a gas or liquid. Different surfaces exert different amounts of friction. It’s easier to slide across ice than to slide across concrete. Friction on a moving object caused by contact with air molecules is called drag, or air resistance.

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Key Questions Roll a ball across three surfaces and describe the force of friction created by each surface. Which surface created the most friction? Why? Where do you think would be the best place to observe the concept of inertia? Why? Will two objects of different masses always fall at the same speed when dropped? Explain your answer.