How can a simple fixed pulley make a job easier?
• by changing the direction at which the force needs to be applied
• by decreasing the work done
• by decreasing the force required to lift the object
• by decreasing the distance that the force needs to be applied
All of the above statements are true. A simple fixed pulley can make a job easier by changing the direction at which the force needs to be applied. Instead of lifting an object straight up, a pulley allows you to lift it vertically. This can be particularly helpful when lifting heavy objects or when the lifting motion is difficult.
Additionally, a pulley decreases the work done. This is because it helps to distribute the force required to lift the object over a longer distance. By pulling downwards on one end of the rope, the object is lifted upwards through a smaller distance. This reduces the amount of work required to lift the object.
Furthermore, a pulley decreases the force required to lift the object. By using a pulley, you can apply a smaller force over a longer distance to lift an object that would otherwise require a larger force over a shorter distance. This makes it easier to lift heavy objects or objects that require a lot of force to move.
Finally, a pulley decreases the distance that the force needs to be applied. Instead of directly lifting an object from the ground, a pulley allows you to lift it vertically by pulling downwards on the rope. This means that the distance over which the force needs to be applied is reduced, making it easier to move the object.