Sir Isaac Newton Laws of Motion November 2011. Sir Isaac Newton 1. Described 3 laws that relate forces to motion 2. Force-a push or a pull, all forces.

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Presentation transcript:

Sir Isaac Newton Laws of Motion November 2011

Sir Isaac Newton 1. Described 3 laws that relate forces to motion 2. Force-a push or a pull, all forces have size and direction

Vocabulary 1. Friction- a force that opposes motion between 2 objects that are touching 2. Inertia-tendency of all objects to stay at rest or in motion 3. Mass- the amount of matter an object is made of

Newtown’s 1 st Law of Motion “Law of Inertia” An object at rest remains at rest and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force

Examples of Newton’s 1 st Law of Motion 1. Car suddenly stops and you strain against the seat belt 2. Car turns left and you appear to slide to the right 3. The difficulty of pushing a car that won’t start

Examples of Newton’s 1 st Law of Motion

Write about it! Write down one example of inertia you see in the room.

Bell Work What is Newton’s 1 st Law of Motion? Is an example of Newton’s 1 st Law when a car turns left and you appear to slide to the right? What is inertia?

Newton’s Second Law of Motion The acceleration of an object depends on the mass of the object and the amount of the force applied

Newton’s Second Law of Motion 1. Force = mass x acceleration F=m x a 2. Force- a push or pull, all forces have size and direction 3. Mass- the amount of matter an object is made of 4. Acceleration-the rate at which velocity changes; and object accelerates if its speed changes, if its direction changes and if both speed and direction changes

Examples of Newton’s 2 nd Law 1. Hitting a softball, the harder the hit, the faster the ball goes 2. Football players and their positions 3. Loaded versus an unloaded truck

Examples of Newton’s 2 nd Law

Bell Work What is Newton’s 2 nd Law of Motion? What is an example of Newton’s 2 nd Law? What is friction?

Newton’s Third Law of Motion 1. For every force, there is an equal and opposite force 2. Action and Reaction

Examples of Newton’s 3 rd Law 1. 2 cars hit head on 2. Jumping out of a boat onto a dock 3. Astronauts in space