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The pulley helps raise or lower the mast. It also helps tighten or losen the mast for how you want it depending on the wind conditions.

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The pulley helps raise the sail. It also helps tighten or losen the sail for how you want it depending on the wind.

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sail boat uses pulley to use and move sail                                                                rock climbing uses pulley to help them climb really high places like mount everest and                                                        the elevator users pulley to move the elevator really fast high up

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sail boat uses pulley to use and move sail                                                                rock climbing uses pulley to help them climb really high places like mount everest and                                                        the elevator users pulley to move the elevator really fast high up

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so a lot of pulleys ares used for different things

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Image #3

The ellavator is being pulled up and down by a pulley

it is easier than walking up a flight of stairs

there is friction heat and sound witch will result in energy loss

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Image #3
It is being used to pull the elevator up and down.

It makes it easier to get around without walking up flights of stairs.

Factors affecting the mechanical efficiency include friction, heat, wind, and sound. The 100% energy you put in is partially going to get lost.

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- THE PULLY IS BEING USED TO PULL UP THE ELAVATOR
- THEY MAKE IT EASIER TO TRAVEL UP OR DOWN FASTER
-  AMOUNT OF PEOPLE IN THE ELIVATOR OR FRICTION ON THE STRINGS

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The momentum wheel is being used to pull the heavy car. The pulleys help bring the elevator down faster and smoother.

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- Pulleys are being use to monitor the boom's movement, it is also used to raise/lower the sail - The pulley helpful because it can give the ability to someone sitting to raise the sail at the top of the boat - The rope's friction can make it harder to pull the sail

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1)
Sailing- raise sail
2) Make it easier to raise the sail
3) Friction, if it gets stuck

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1) They are being used to help someone climb up the wall

2) It's making it easier for the person on the wall to climb and the person who is lifting them up

3) Rope isn't strong, its a human puling not a machine, might get worn out.