Blood rushes from your head to your feet while quickly stopping when riding on a descending elevator. The head of a hammer can be tightened onto the wooden handle by banging the bottom of the handle against a hard surface. A brick is painlessly broken over the hand of a physics teacher by slamming it with a hammer. (CAUTION: do not attempt this at home!) To dislodge ketchup from the bottom of a ketchup bottle, it is often turned upside down and thrusted downward at high speeds and then abruptly halted. Headrests are placed in cars to prevent whiplash injuries during rear-end collisions. While riding a skateboard (or wagon or bicycle), you fly forward off the board when hitting a curb or rock or other object that abruptly halts the motion of the skateboard. 1) Adding a flywheel to the crankshaft of an engine to ensure smoother operation. 2) A cars mass and its braking distance (more mass = more inertia = greater braking distance) 3) American football (a defensive lineman needs a larger mass than a wide receiver). 4) Sumo wrestling (the larger the wrestler, the harder he is to shove out of the ring) 5) Bowling (inertia of ball is much greater than that of pins so ball plows through them) Why use seat belts? Riding in a car you and the car have the same motion. When the brakes are applied, the brakes stop the car. What stops you? Eventually the steering wheel, the dashboard, or the window unless they are replaced by a seat belt, which stops your body. When the accelerator is depressed with the car in gear the motor turns the wheels and the car moves forward. What moves you forward? As the car moves forward the seatback comes forward, contacts, you and pushes you forward.
Posted on: Thu, 14 Aug 2014 07:20:21 +0000
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