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26 Cards in this Set
- Front
- Back
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Powered is measured in what unit?
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watt
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The metric unit for work is
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Joule
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The unit used for force is?
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newton
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The force of an object that has traveled a distance is the definition of what?
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work
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The ratio of output force to input force of a simple machine is called?
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mechanical advantage
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work output=work input is used to describe what type of machine?
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simple
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A bicycle is an example of what type of machine?
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complex
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Work divided by the time that it took the object to do work is called?
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power
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Mr. Webster and I both stand in front of a rope/pulley system. He wants to use three ropes on his pulley and I want to use six to pull up 200N. What has more mechanical advantage?
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Phillips
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Who uses more force?
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Webster
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Who has to pull more rope?
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Phillips
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Who does more work?
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same
****work output=work input |
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The fixed point on a lever is called?
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fulcrum
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When a screw driver turns a screw, the forces do what together?
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multiply
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what are examples of simple machines?
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screw, rope/pulley, gears, lever
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Circumference/lead is the equation to find mechanical advantage of?
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screw
**take the circumference of the screw divided by the distance the screw was turned. |
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Joann, who has a force of 45 newtons, climbed 3 meter up a ladder to rescue her cat from a tree. How much work against gravity did she do?
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135J
*work=force x distance |
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A machine does 1,500 J of work in 30 seconds. What is the power of this machine?
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50watts
*power = work/time |
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Suppose a force of 100 newtons is used to push an object a distance of 5 meters in 15 seconds. Find the amount of power done.
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33.3 watts
*power = work/time |
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A machine uses an input force of 200 newtons to produce an output force of 80 newtons. What is the mechancial advantage?
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.4
MA= force output/force input |
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How much work is done to carry a 20 newton book across a 5 meter room?
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0
*no work is done in carrying an object. |
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How much work is done to a 40 newton box that is lifted 8 meters?
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320 Joules
*work= forcex distance |
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A 50 Kilogram bicycle racer climbs a 250 meter hill. How much work has he/she done?
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122,500Joules
*work=mgh |
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A 60 tooth gear is connected to a 24 tooth gear. If the smaller gear turns ten times, how many times does the larger gear make?
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4 turns
To/Ti=Ni/No |
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What is the gear ratio if the input gear has 24 teeth and the output gear has 36 teeth?
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2:3
input:output |
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A machine puts off 250 watts of power for every 1250 watts put into it. The efficiency is?
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20%
*250watts/250wattsx 100=20% |
