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13 Cards in this Set

  • Front
  • Back
  • 3rd side (hint)
machine
a device that helps you acoomplish a task
simple machine
unpowered device
input force
anything that you do to make a machine work
output force
whatever the machine does for you
mecanical advantage
ma=output force/input force
*no units because they cancel out
*ma increases as the machine improves
work
moving something over a distance
1st class lever
fulcrum is between output and input
*OFI
*examples: balance and scissors
2nd class lever
output is between fulcrum and input
*FOI
*examples: wheelbarrow, bottle opener, and nutcracker
3rd class levers
Input is between fulcrum and output
*FIO
*examples:hammer and tweezers
gear ratio
is life mechanical advantage
*calcuated by comparing the # large wheel teeth/the # small wheel teeth

*examples: bicycle, clock, drill, and car engine
5 simple machines
lever, pulley, gear, ramp, and whell and axle
*Lets Pull Grandma's Red Wagon
lets pull grandma's red wagon
why is a ma of 1 still important?
it means it changed the direction of the input force
pulley
also called a block and tackle
*the # of supporting stands determines the mechanical advantage of the system
*ropes carry tension force along their lengths which acts in the same direction of the rope
*the force in a rope is the same no matter where you measure it-this means that every supporting strand in a pulley provides the same amount of force that you are applying to the end