Pulleys
This type of pulley is attached to the load
Moveable pulley
What came before the wheel and axle that the Egyptians used? How did it help them move things?
Rollers. By reducing friction.
The outside bumps on a gear are called...
Teeth or cogs
What class of lever are scissors
Class 1
A tool or device that makes work easier
Simple Machines
What is the advantage of a single fixed pulley?
It changes the direction of the force
Why are simple machines important?
They make work easier for us.
The gear that begins the movement of other gears
The driver
What class of lever is a hockey stick
Class 3
The rubbing together of two objects causes this
Friction
A curtain is this type of pulley
Fixed
What are the 6 simple machines?
Wedge, screw, inclined plane, wheel and axle, pulley, lever
The name of the gear that is moved by the first gear when there are only 2 gears? Also which direction will it move?
Follower. Opposite to the driver.
What class of lever is a nutcracker
Class 2
What force pulls things towards the earth. For example, this force prevents you from floating away.
Gravity
What is the advantage and disadvantage of a moveable pulley?
It reduces the force needed by half but it needs to be pulled twice as far
Which two types of simple machines make up a shovel?
Wedge and lever
The gear between the first and third gear
Idler
What is the mnemonic device we use to remember the different types of levers. Explain it.
FLE 123. For each class of lever (1,2,3) the matching letter is in the middle of the lever.
A push or pull on an object
Force
A scaffolding lift is this type of pulley
Combination pulley
What are 3 signs that there is too much friction between objects?
Heat, noise, worn out
What type of simple machine is a gear
Wheel and axle
Name 2 levers you have in your body
arms, legs, toes, fingers
The formula to calculate work
Force x distance = work