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Transcript
A ball released and allowed to roll down one ramp and it quickly slows to a stop rolling up the next ramp in A. The same ball is released and allowed to roll down the ramp and it slowly slows to a stop rolling up the next ramp in B. The same ball is released and allowed to roll down the ramp and onto a smooth horizontal surface. 1. What do you think will happen to the ball in C? This is a photo of a car seat advertised in the 1950’s. Seat belts are not part of the design. 2. Carefully examine the early car seat model shown above. If the car was moving forward and came to a sudden stop, what would happen? This polar bear slipped and fell on the ice. 3. What would have prevented this bear from slipping? What is unique about the surface it slipped on? 2 straws and a marble 1. What did you have to exert on the marble to get it to start moving? 2. What did you have to exert on the marble in order to slow it to a stop? 3. What did you have to exert on the marble in order to change its direction? 4. If the marble was rolling along, did you have to exert a force to keep it rolling? 5. In the absence of friction, and with an infinitely long table top, once the marble is rolling, would it stop on its own? Add to Force and Motion Notes • What are some examples of forces: – Friction (opposes motion, goes in opposite direction) – Normal (supporting force ex: chair pushing up on your butt, table holding the TV) – Tension (pulling force along a wire or string) – Gravity (attractive force between masses) – Applied (push or pull exerted by an outside object) • Remember we need an unbalanced forced to cause a change in motion. • The motion will not change if the forces acting on it are ZERO! • Tendency of an object to maintain its present motion or no motion is INERTIA Eureka • Inertia – (start at 1:20) http://www.youtube.com/watch?v=by7kkAu2Pg • **Mass ** http://www.youtube.com/watch?v=uvy4nWh0KwE&feature=related • What is another word for Inertia? laziness • Inertia is related to what property of matter? mass Hover pucks • Describe before during and after • Design a situation in which the hover puck moves with constant velocity.