Question
How does a pulley make work easier when it is used to lift an object?
It changes the direction of the lifting force to work with gravity.
It changes the direction of the lifting force to work with gravity.
It decreases the distance over which the force must be applied to lift the object.
It decreases the distance over which the force must be applied to lift the object.
It reduces the weight of the object being lifted.
It reduces the weight of the object being lifted.
It increases the amount of work produced to lift the object.
It increases the amount of work produced to lift the object.
It changes the direction of the lifting force to work with gravity.
It changes the direction of the lifting force to work with gravity.
It decreases the distance over which the force must be applied to lift the object.
It decreases the distance over which the force must be applied to lift the object.
It reduces the weight of the object being lifted.
It reduces the weight of the object being lifted.
It increases the amount of work produced to lift the object.
It increases the amount of work produced to lift the object.
Answers
Answered by
GPT-4o mini
A pulley makes work easier primarily by **changing the direction of the lifting force**. When you use a pulley, you can pull down (or sideways) to lift an object upward, which often feels more manageable than lifting it directly against gravity.
Here’s a breakdown of the options you provided:
1. **It changes the direction of the lifting force to work with gravity.** - This is correct. A pulley allows you to exert your force in a direction that may be easier for the user, such as pulling down rather than lifting up.
2. **It decreases the distance over which the force must be applied to lift the object.** - This is not necessarily true for a simple pulley. While some pulley systems (especially those using multiple pulleys) can reduce the distance, a single fixed pulley does not decrease the distance; it only redirects the force.
3. **It reduces the weight of the object being lifted.** - This is incorrect. A pulley does not change the weight of an object; it simply changes the direction of the force applied to lift it.
4. **It increases the amount of work produced to lift the object.** - This is also incorrect. A pulley does not increase the total amount of work done; it only redirects the force required to lift an object. The work done (force times distance) remains the same.
In summary, the main benefit of a pulley is its ability to change the direction of force, making it easier to lift heavy objects.
Here’s a breakdown of the options you provided:
1. **It changes the direction of the lifting force to work with gravity.** - This is correct. A pulley allows you to exert your force in a direction that may be easier for the user, such as pulling down rather than lifting up.
2. **It decreases the distance over which the force must be applied to lift the object.** - This is not necessarily true for a simple pulley. While some pulley systems (especially those using multiple pulleys) can reduce the distance, a single fixed pulley does not decrease the distance; it only redirects the force.
3. **It reduces the weight of the object being lifted.** - This is incorrect. A pulley does not change the weight of an object; it simply changes the direction of the force applied to lift it.
4. **It increases the amount of work produced to lift the object.** - This is also incorrect. A pulley does not increase the total amount of work done; it only redirects the force required to lift an object. The work done (force times distance) remains the same.
In summary, the main benefit of a pulley is its ability to change the direction of force, making it easier to lift heavy objects.
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