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### 17 Cards in this Set

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• Back
 Simple Machines - levers - Ramps (inclined planes) - pulleys Perfect machines 100 % efficient Win=Wount Win- work i do on machine Wout- work done on object Win=Wout Findin=Foutdout Fin- small din- big Fout- big dout- small Tradeoff between F and d Mechanical Advantage - factor that a machine multiplies force MechAdv- 5 5 times more force than put in Efficiency Measure of how much energy gets wasted by the machine Bigger machine- wasting less Eff= Win/Wout Energy Source Idea - You can't get something from nothing, everything < 100 % efficient - hidden costs - plastic Circular Motion Motion in a circular pattern Rotation Turning around an internal axis (spinning) Day and night Revoluton Moving around an external axis (orbitting) Year (365 rotations) Rotational speed rate of turning- same for all parts of a rigid object rot/s, rev/min (RPM) Trips around per time Tangential (linear) Speed Rate of covering distance ms. proportionl to the distance from axis Turning -Turning is acceleration! Force requires to turn always pushes inward. Centripetal Force "Center directed" Inward force that causes turning. - turning tighter and at a faster speed requires Fcentrip Centrifugal Force "Center Fleeing" - does not exist -Illusion created by Inertia Simulated Gravity 1g- sensation of normal gravity 2-3 RPM- can adapt - antything above can create dizziness Center of Mass (cm) average of mass in an object - follows the "expected trajectory" - serves as a natural axis of rotation - can pretend that alk the gravity force acting on an objects acts at the cm - An object will fall over if its center of mass extends beyond its base of support Increase Stability Make base of support bigger - lower center of mass