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### 23 Cards in this Set

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 What simple machine is a crow bar that pries a door open? Lever Name the 6 simple machines lever, pully, wedge, inclined plane, wheel + axel, screw 2 factors that influence whatever roughness + pressure What is something assumed to be stationary so that anything moving can be compared to it? A frame of reference What is a force a push or a pull What simple machine is an axe blade that chops wood? Wedge Give an example of rolling friction rollerskating Give an example of sliding friction Sledding Give an example of static friction sitting in a chair Tug o war=balanced or unbalanced? unbalanced in order 2 do work, what 2 things are needed?? 1. There must be movement 2.The movement must be in the same direction as the force What is a machine? A device which helps make work easter What is an efficient machine? A machine which utilizes its input work to get maximum output OR a machine that is as close to 100% efficient as possibel Velocity is ____ with _____ speed, direction A mother pushing a stroller=(balanced/unbalanced) unbalanced Which machine is really just a modified inclined plane? Screw Intertia is... the tendency if an object to resist change in its motion Acceleration can/cannot be positive/negative can/negative Net force is that.. total amount with the arrows Ideal is with/without friction/pressure without friction If an astronaut runs out of fuel in his jet pack, what can he do to get back to his space station? Take his jet pack off and push off in the direction of the space station What is that astronaut going back to its space station an example of? law 1, 2, or 3? law three How is a ferris wheel that goes at a constant speed accelerating? because its always changing direction