machines practice exam
What two simple machines is a wheelbarrow made up of? - correct answer
✔Wheel and lever
What are machines fueled by? - correct answer ✔Energy
Describe the difference between a simple machine and a complex machine.
Give an example of each. - correct answer ✔A simple machine is a device
that requires the application of a single force to work. A complex machine is
several simple machines put together. An example of a simple machine is a
wedge. An example of a complex machine is a stapler.
The first law of thermodynamics says that a machine cannot create any more
_____ than is supplied as fuel. - correct answer ✔energy
True or False. The amount of work is less when you use a machine. - correct
answer ✔false
What is Mechanical Advantage? - correct answer ✔Mechanical advantage
decreases the amount of force needed to do work, but does not change the
amount of force.
Explain the difference between a fixed pulley and a movable pulley. - correct
answer ✔A fixed pulley is a pulley that is attached to a stable structure and
does not move. A fixed pulley does not have any mechanical advantage. You
need to use the same amount of effort to lift an object. A movable pulley has
one end of a rope tied to something stable and both the pulley and the load
move. A movable pulley has a mechanical advantage.
, Calculate the mechanical advantage if a machine allows you to move a 60
newton rock by only exerting 15 newtons of force. - correct answer
✔Mechanical Advantage is calculated by dividing distance you moved the
rock, by the amount of force used. MA = = 4 newtons
True or False. A pulley is a system of wheels and ropes. - correct answer
✔True
Calculate the mechanical advantage of a ramp if the box you are trying to
move has a mass of 10 kilograms, the board is 15 feet long and the height of
the ramp is 5 feet. - correct answer ✔The mechanical advantage of a ramp is
ramp length / ramp height = 15/5 = MA = 3
What is the mechanical advantage of a simple block and tackle with one
rope? - correct answer ✔2
Explain how the length of the ramp affects the amount of work that must be
done. - correct answer ✔The length of the ramp does not affect the amount
of work that must be done. Regardless of ramp length the item must be
moved the same distance. The length of the map will affect the amount of
force that needs to be applied.
Explain what a gear ratio of 4:9 means. - correct answer ✔A gear ration of
4:9 means that for every 4 turns of the driver wheel, the follower wheel turns 9
times.
What is the equation to determine the MA of a wedge? - correct answer
✔The mechanical advantage of a wedge is the same as that of other inclined
planes. MA = length / width
What two simple machines is a wheelbarrow made up of? - correct answer
✔Wheel and lever
What are machines fueled by? - correct answer ✔Energy
Describe the difference between a simple machine and a complex machine.
Give an example of each. - correct answer ✔A simple machine is a device
that requires the application of a single force to work. A complex machine is
several simple machines put together. An example of a simple machine is a
wedge. An example of a complex machine is a stapler.
The first law of thermodynamics says that a machine cannot create any more
_____ than is supplied as fuel. - correct answer ✔energy
True or False. The amount of work is less when you use a machine. - correct
answer ✔false
What is Mechanical Advantage? - correct answer ✔Mechanical advantage
decreases the amount of force needed to do work, but does not change the
amount of force.
Explain the difference between a fixed pulley and a movable pulley. - correct
answer ✔A fixed pulley is a pulley that is attached to a stable structure and
does not move. A fixed pulley does not have any mechanical advantage. You
need to use the same amount of effort to lift an object. A movable pulley has
one end of a rope tied to something stable and both the pulley and the load
move. A movable pulley has a mechanical advantage.
, Calculate the mechanical advantage if a machine allows you to move a 60
newton rock by only exerting 15 newtons of force. - correct answer
✔Mechanical Advantage is calculated by dividing distance you moved the
rock, by the amount of force used. MA = = 4 newtons
True or False. A pulley is a system of wheels and ropes. - correct answer
✔True
Calculate the mechanical advantage of a ramp if the box you are trying to
move has a mass of 10 kilograms, the board is 15 feet long and the height of
the ramp is 5 feet. - correct answer ✔The mechanical advantage of a ramp is
ramp length / ramp height = 15/5 = MA = 3
What is the mechanical advantage of a simple block and tackle with one
rope? - correct answer ✔2
Explain how the length of the ramp affects the amount of work that must be
done. - correct answer ✔The length of the ramp does not affect the amount
of work that must be done. Regardless of ramp length the item must be
moved the same distance. The length of the map will affect the amount of
force that needs to be applied.
Explain what a gear ratio of 4:9 means. - correct answer ✔A gear ration of
4:9 means that for every 4 turns of the driver wheel, the follower wheel turns 9
times.
What is the equation to determine the MA of a wedge? - correct answer
✔The mechanical advantage of a wedge is the same as that of other inclined
planes. MA = length / width
