0
No.
Conservation of energy shows that any system can only deliver as much energy as is put in.
In reality, all systems are less than 100% efficient, so any practical system will waste some (or much) of its input energy.
But a pulley system can *multiply* force.
Take a setup with a one-sheaf (wheel) pulley at one end, and a one-sheaf pulley at the other. Correctly strung, you will find that pulling two feet of rope will lift a load only one foot.
If it were perfectly frictionless, you could draw on the rope with a 50-pound pull and lift a 100-pound load.
It may seem that you've done magic with the rope - it's lifting 100 pounds, so how strong must it be? The answer is that there are two sections of rope supporting the load between the sheaves, so each section only bears (100/2) = 50 pounds.
This is why you'll often see cranes with multiple-sheaf pulleys - the winding gear must wind *a lot* of steel rope to life or lower the load, but the rope can be much thinner than if a single rope was used.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What does a pulley do to the direction of a force?
Pulleys change the direction of a force.
What pulleys are attached to an overhead structure and change the direction of force?
Lifting pulleys are attached to an overhead structure, and change the direction of force. You pull down, and the pulley pulls up.
Does a pulley use less force?
There are a variety of different designs for pulleys, depending upon what you need to do with them. A pulley can be used to change the direction of a force without changing the amount of force that you apply, but there are also pulleys that do reduce the amount of force you have to use to lift something.
What force could increase the resistance of all the PULLEYS?
Any force that will not allow the pulley to operate to peak efficiency
What type of pully can multiply effort force?
Actually, pulleys cannot multiply effort force. It can only change the direction of the effort force.
How is IMA determined for pulleys?
IMA for pulleys is the resistance force divided by the effort force.
What does a pulley do to the direction of a force?
Pulleys change the direction of a force.
How do you generate force and momentum?
You can generate force and momentum by applying pressure.
How can pulleys change direction of the force?
yes
Example to lift a force upward we use 2 pulleys. Then the force becomes half of the force we will have to use with one pulley.HOW?
Example to lift a force upward we use 2 pulleys. Then the force becomes half of the force we will have to use with one pulley.HOW?"
How pulleys help humans?
can change a direction of a force
What do fixed pulleys always do?
change the direction of force
What do fixes pulleys always do?
change the direction of force
What pulleys are attached to an overhead structure and change the direction of force?
Lifting pulleys are attached to an overhead structure, and change the direction of force. You pull down, and the pulley pulls up.
Does a pulley use less force?
There are a variety of different designs for pulleys, depending upon what you need to do with them. A pulley can be used to change the direction of a force without changing the amount of force that you apply, but there are also pulleys that do reduce the amount of force you have to use to lift something.
How do you find the mechanical advantage of a simple machine?
To find the mechanical advantage of a simple machine divide output force by input force. (input force is the force that we exert on a machine, and output force is the force that is exerted by a machine).
Can the number of pulleys affect the amount of force to lift a heavy objects to a high place?
Increasing the number of pulleys divides the force required to lift up a heavy object; increasing the number of pulleys decreases the force needed by the person (or motor) pulling the first end of the pulley system. However, it is important to know that it does not affect the total work needed to lift up the object. As the force is decreased, the distance of rope needed increases to compensate for a conserved amount of work required for the load to be lifted.
