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2.2: Inertia & Newton’s First Law

2.2: Inertia & Newton’s First Law. What happens when. You’re driving along and suddenly slam on the brakes? Your car stops, your body... You make a sharp right turn. The car goes right, your body... You’re stopped at a red light and the light turns green. You hit the gas.

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2.2: Inertia & Newton’s First Law

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  1. 2.2: Inertia & Newton’s First Law

  2. What happens when... • You’re driving along and suddenly slam on the brakes? • Your car stops, your body... • You make a sharp right turn. • The car goes right, your body... • You’re stopped at a red light and the light turns green. You hit the gas. • The car jerks forward, your body...

  3. Why?

  4. Galileo’s Thought Experiment • The ball speeds up as it goes down the ramp and slows down as it goes up the ramp. • Imagine no friction at all between a ball and a ramp. • The ball stops on the other side when it reaches its initial height.

  5. What if the ramp continued on in a straight line? • Without friction or any other force to stop it, the ball would continue moving at a constant velocity. • Inertia causes the ball to resist changes to its motion.

  6. Inertia • The property of matter • Anything that has mass has inertia • Causes an object to resist changes to its state of motion • If at rest, it will want to stay at rest • If in motion, it will want to stay in motion • Directly proportional to the object’s mass (the more mass, the more inertia)

  7. Make a prediction... Vcar = 80 km/h Will the car be able to make it up the ramp and be able to come to a complete stop inside the trailer?

  8. The Mythbusters find out... http://www.youtube.com/watch?v=dYlstdCWzCY

  9. Newton’s First Law of Motion If the net force acting on an object is zero, the object will maintain its state of rest or constant velocity.

  10. This means: • Objects at rest will remain at rest unless acted upon by a net external force. • Objects in motion will remain in motion unless acted upon by a net external force. • If the velocity of an object is constant (or zero), the net external force acting on it must be zero. • If the velocity of the object is changing in magnitude, direction, or both (acceleration), the change must be caused by a net external force on the object.

  11. Some applications of Newton’s 1st Law: • Seatbelts • Don’t allow your body to move forward • Airbags • Slow the deceleration of your body • Concussions • the brain collides with the inside of the skull • Shaken Baby Syndrome

  12. Homework Examples on the Board Pg. 126 #1-5 Pg. 129 # 2-10, 12,13

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