Pulleys and Inclined Planes Quick Check
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Question
Use the image of the pulley to answer the question.
An illustration shows a system of two pulleys lifting a block.
Lifting the weight without a pulley requires a force of 400 newtons over a distance of 4 meters. How do these values change when the pulley is applied?
(1 point)
Responses
The force increases, while the distance decreases.
The force increases, while the distance decreases.
Both the force and the distance increase.
Both the force and the distance increase.
Both the force and the distance decrease.
Both the force and the distance decrease.
The force decreases, while the distance increases.
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The force decreases, while the distance increases.
What is the effect of using this inclined plane
(image of a man rolling a cylinder object up a ramp)
Using the inclined plane reduces the amount of force needed to lift the object vertically, but increases the distance the object needs to be moved horizontally. This makes it easier to move heavy objects to higher elevations.
so the object can be lifted with less force then?
Yes, that's correct! By using the inclined plane, less force is needed to lift the object to a higher elevation compared to lifting it straight up. The inclined plane allows the force needed to lift the object to be spread out over a longer distance, which makes the task easier to accomplish.
will you help me with a couple of other questions bot?
Of course! I'll do my best to assist you. What are your other questions?
What is accomplished by this simple pulley?
(image of man lifting a brick with a pulley)
Using a pulley reduces the force required to lift the brick. With a single fixed pulley, the force needed to lift the brick is equal to its weight. However, the pulley allows the force to be spread out over a longer distance, making it easier to lift the brick. By pulling down on the rope, the person can apply a force that is greater than the weight of the brick, allowing them to lift it up. So, with the simple pulley, the person can lift the brick with less force than if they had lifted it directly, without the pulley.
so it changes the direction of the force?
Yes, that's correct! A single fixed pulley only changes the direction of the force needed to lift the object. Instead of lifting the object vertically, the person can pull down on the rope to lift it up. Although the amount of force needed to lift the object does not change, the direction of the force is easier to apply, which can make the task easier to accomplish.
okay, the next one is: Which advantage does a screw have over a nail?
A screw is pushed through a shorter distance.
A screw allows the force to be applied in a more convenient direction.
A screw is able to reduce the total amount of work needed.
A screw can be inserted with less force than a nail. (my answer)