Newton’s Laws. 1. What is Newton’s 1 st Law of Motion? An object at rest will remain at rest and an object in motion will remain in motion unless acted.

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Presentation transcript:

Newton’s Laws

1. What is Newton’s 1 st Law of Motion? An object at rest will remain at rest and an object in motion will remain in motion unless acted upon by an unbalanced force.

2. What does this mean? If an object is not moving, it will not move until a force acts on it. If an object IS moving, it will not stop until a force acts on it.

3. What is inertia? The tendency of an object to resist a change in motion. The more mass, the more inertia!

4. What is Newton’s 2 nd Law of Motion? Acceleration depends on the net force acting on the object AND on the object’s mass or

5. What does this mean? Acceleration and force are directly proportional…the greater the force, the greater the acceleration. small acceleration big acceleration Big push Small push

Acceleration and mass are inversely proportional…the greater the mass, the smaller the acceleration. small mass big mass big acceleration small acceleration

The forces will be equal when the truck crashes into the car. Which will accelerate faster after the collision? Explain.

6. What’s Newton’s third law of motion? Action-Reaction For every action, there is an equal and opposite reaction

Examples: Reaction Action Rocket!

ActionReaction Rowing!

Action Reaction Walking

Action Reaction