Pulleys
This simple machine uses a rope and wheel
what is a pulley
These helps gears connect and turn each other
A small gear turning a big gear makes it go this
what is slower
this tall object uses a pulley to raise a flag
what is a flagpole
explain why pulleys help lift objects
they reduce effort/make lifting easier
This is the object you lift using a pulley
what is a load
Gears are used to do this with motion
what is transfer motion
a big gear turning a small gear makes it go there
what is faster
This machine uses pulleys to lift heavy loads at construction sites
What is a crane
why do bikes have different gear sizes?
to change speed and make pedaling easier
This happens when you pull down on a pulley rope
What is the rope goes up
If gears are not lined up this happens
What is they won't turn/work properly
Pulleys change the _____ needed to lift objects
What is force
this everyday object uses gears to help you ride
what is a bicycle
what would happen if a gear had no teeth
it wouldn't turn another gear
Using more pulleys makes lifting feel like this
What is easier/less force needed.
A gear system with many gears is called this
what is a gear train
This is what pulleys do to the direction of force
what is change it
this device uses gears to help you tell time
what is a clock
You need to lift a very heavy bucket. Would you use one pulley or many? Why?
Many pulleys, because they reduce the force needed