Science Lever and Pulley/ Wedge
Created by ftbrady
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the fixed point which a lever turns on is called
fulcrum
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other than multiplying a force, what else can levers do
change the direction of a force
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how would you determine what class a lever is
look in the middle and be FRE; fulcrum in middle=class 1, resistance in middle = 2; effort in the middle = class 3
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what happens to the force needed to move an object as you increase the length of effort arm
force needed would decrease as you increase the effort arm
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what would happen to the force required if you decreased the length of the effort arm?
the force needed would increase
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ALL LEVERS make work easier
false; the 3rd class lever does not make work easier; They give you increased speed
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pulleys can_____ a force or change is ______
direction
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3 types of pulleys
single movable, single fixed, block and tackle
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how do you find the mechanical advantage of a block and tackle
count the sections of rope supporting the weight
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ALL PULLEYS make work easier
false; they only change the direction and force
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how does the distance of the string you pull compare to the distance the weight if lifted when using a block and tackle system
the distance of the string you pull is much greater than the distance the object is lifted; trading increased distance for decreased force.
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what is the MA of a single fixed pulley?
1
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what is the MA of a single moveable pulley
2
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what makes something a compound machine instead of a SM
composed of 2 or more SM
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label each machine S simple or C compound
scissors___ramp___single fixed pulley____ pry bar____ bicycle____ shovel____
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list 3 of your own examples of CM
________, ________,____________
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mechanical advantage is how much the machine _____ your force
multipplies
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what does it mean about a machine if it has a mechanical advantage of 1
the machine doesn't increase your effort/input force; the force the machine applies to an object is the same as the force you put in. It doesn't help you by making you stronger
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would machines with higher mechanical advantage take more or less effort force to make some move
less
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would machines with higher mechanical advantage take more or less work to make something move
more with friction
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if you have a choice between a machine with a MA of 4 and a machine with an MA of 6, which machine would it make more sense to use
MA of 6 ; you would not have to use as much effort force
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objects with larger radius_______, object with smaller radius ________
wheel; axle
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what would take less force to turn an axle with a diameter of 10 cm using a 50 cm or a 100 cm wheel
axle with a diameter of 10 cm using a 100 cm wheel
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why would the 100 cm wheel be easier
it has a larger wheel and when you increase the effort distance, you decrease the effort force needed
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what would require the least amount of work to turn axle with diameter of 10 cm using 50 or 100 cm wheel
both amounts of work are the same due to the axles being the same. the 100 would be easier as it travels a greater distance
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what is a specific advantage of using a screw instead of an inclined plane
completing the same goal using a smaller space
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what does the wedge do as it moves into a matereial
separates the material
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what is the major difference between the wedge and an inclined plane
the wedge moves
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if you have 2 wedges that are 8 cm on top but A is shorter than B which would require the least amount of force
B it has a greater distance (length)
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What is the rule for question 29
When you increase the distance, you decrease the force (makes work easier)