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