a kind of wheel on an axle over which a rope, belt, cable, or chain passes. Most have a groove to hold rope in place.
100
Wha is the advantage of a fixed pulley?
It changes the direction of the effort force used to lift the load.
100
What is a block and tackle?
combined pulleys (fixed and moveable) to increase force.
100
what is a belt drive?
a belt looped around at least 2 pulleys.
200
What is force?
is a push or pull on something
200
What is the disadvantage of a fixed pulley?
the effort force is rqual to the load force. You have to use as much effort as the weight of the object.
200
What is the "tackle"
rope
200
List 2 pulley systems you see in our school.
blinds, flag pole
300
what is a fixed pulley?
a pulley that is attached to a structure and does not move
300
What is the advantage of a moveable pulley?
You only have to pull with half of the effort force to lift the load
300
What is the block?
The casings that hold the pulleys together
300
List 3 everyday objects that use pulleys?
-variety of answers
400
What is a moveable pulley?
a pulley that is not fixed in place. It moves with the load.
400
What is the disadvatage of a moveable pulley?
The direction of the effort force can be very inconveinent when you have to push away from yourself.
400
What is the maximum amount of sets of pulleys?
4
400
what is the advantage of using fixed and moveable pulleys together?
get mechanical advantage from a moveable pulley (cutting the weight of the load in half) and changes the direction of force (pull down rather than pull up)
500
What is mechanical advantage?
an advantage that a machine can give us by making it easier for us to do something.
500
When you lift a mass of 100kg with a single moveable pulley system, you apply a force of 50kg. Explain why.
The moveable pulley cuts the effort force in half as the moveable pulley moves with the load it supports the load making it lighter.
500
Why does a block and tackle not use up to 5 sets of pulleys? explain. (3)
It requires too much rope and farther distance. Therefore it is not efficient
500
Draw a diagram of a block and tackle with a mechanical advantage of 2. Label the effort force, load force, motion, fixed pulley, moveable pulley.