Do all pulleys change the amount of force needed to move an object? Justify your answer

Explain how a pulley changes the amount of force needed to lift an object.

No they don't. A single rope and a single pulley changes the direction but not the force. Several pulleys with a several pulleys, known as a block and tackle, will change the force required.

http://www.explainthatstuff.com/pulleys.html.

Hey guys these are my answers!

1.false
2. C
3. D
4. B
5. D
6. A
7. B
8. A
9. The value of using international system of units when describing motion scientists use meters and seconds.
10.A: The pulley doesn’t change the amount of force it stays the same.
B: Nope the pulley only changes directions without adding or taking away any force.

i dont get it

Thank you!

Thankyou

anyone figured this out yet?

Not all pulleys change the amount of force needed to move an object. There are two main types of pulleys: fixed pulleys and movable pulleys.

A fixed pulley does not change the amount of force needed to move an object. It only changes the direction of the force. When you use a fixed pulley, you pull down on one side of the rope, and the object is lifted upwards on the other side. The force required to lift the object is the same as the force you apply.

On the other hand, a movable pulley does change the amount of force needed to move an object. With a movable pulley, one end of the rope is attached to a fixed point, and the other end is attached to the object. As you pull down on the rope, the object is lifted upwards. In this case, the force required to lift the object is half of the force you apply. This is because the weight of the object is distributed between the rope segments connected to the movable pulley.

To understand why the force is reduced with a movable pulley, you can use the concept of mechanical advantage. Mechanical advantage is the ratio of the output force (the force needed to move the object) to the input force (the force applied to the rope). In the case of a movable pulley, the mechanical advantage is 2:1. This means that for every 2 units of force you apply, you can lift an object weighing 1 unit. So, the pulley effectively reduces the amount of force needed to move the object.

In summary, not all pulleys change the amount of force needed to move an object. Fixed pulleys only change the direction of the force, while movable pulleys reduce the amount of force required to lift an object by distributing the weight between multiple segments of the rope.