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### 28 Cards in this Set

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 In science, work is accomplished when... a force acts on an object as it moves through a distance. 14A Formula for work... w=f x d 14A a newton-meter is also a... joule (which is also kg x m2 _______ s2 ) 14A Things that make work easier that have only one or two parts... simple machines 14A Machines can do these 3 things, but never this... can do: increase the amount of force, change the direction of force, and change speed of force can't do: increase the amount of work done or energy expended 14A a bar that turns on a point... lever. The point is the fulcrum. 14A Law of Moments... w1d1 =w2d2 14A In first class lever, where is the fulcrum? between the effort on one end and the resistance on the other 14A Force multiplying ability... mechanical advantage 14A mechanical advantage formula.. ratio of resisting force /applied force or ratio of distance effort applied/distance resistance moves 14A In a second class lever, the resistance is... between the effort on one end and the fulcrum on the other. 14A In a third class lever, the resistance is... on one end, the effort in the middle, and the fulcrum on the other end. 14A Name the class of these levers: wheelbarrow, biceps, seesaw. second, third, first 14A This modified lever overcomes the limited distance that a resistance can be moved with a lever... wheel and axle 14B A single fixed pulley doesn't give you any mechanical advantage but it does... change the direction of force. 14B A single moveable pulley gives you an advantage of... 2 (but the rope must be pulled twice as far as the weight rises) 14B An arrangement of fixed and moveable pulleys... block and tackle 14B To find the mechanical advantage in a block and tackle... count the number of ropes supporting the resistance. 14B Distance principle... any reduction in the effort force will be paid for by an increased distance through with the force must act 14B Inclined planes reduce the ... effort to raise a load 14B The mechanical advantage of an inclined plane... length of incline/height Two inclined planes placed bottom to bottom... wedge An inclined plane wrapped around a cylinder... screw The distance between two adjacent threads on a screw... pitch. (also defined as the distance it moves inward for each turn it is given) A machine's actual performance (or ratio of work output to work input)... its efficiency Rate of doing work... Power Power formula... work/time Units for power... watts (W)