Why Is Work the Same for Different Distances on an Inclined Plane?

In summary, the minimum force required to lift an object vertically is the same as the minimum force required to move the object up a ramp, and by increasing the distance from 0.5 to 4, the necessary force is reduced by a factor of 8. The assumption that work is the same for both scenarios comes from the fact that the added horizontal component is taken into consideration when pushing the object up the ramp.
  • #1
lovelyrwwr
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Screenshot_2013-10-05-04-37-13.png
W = fd
The answer is 8. The solution manual says work is the same for either scenario, d = 4 or d = 0.5

From this assumption I can see that by increasing distance from 0.5 to 4, you reduce the force necessary by a factor of 8.

However what I cannot comprehend is: where does the assumption that work is the same for both scenarios come from? Since you have the added horizontal component to consider when pushing it up the ramp, isn't that extra work? Or...Have I labeled the triangle incorrectly? Should the 4 be labeled on the other leg rather than the hypotenuse?Sorry if this is a silly question but I haven't taken intro physics in a couple years and am currently studying for the mcat. It seems not all of the principles of physics have hstayed with me lol. Thank u in advance pf!

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The Attempt at a Solution

 
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  • #2
You can analyze this problem in this way

The min force required to lift an object of mass m vertically up from bottom to top of the step is F1= mg

The min force required to move an object of mass m up along the ramp from bottom to top of the step is F2= mgsinθ

From this you can deduce F2=F1/8 .

Does this help ?
 
  • #3
Yasssss! Thank you so much!
 

FAQ: Why Is Work the Same for Different Distances on an Inclined Plane?

What is an inclined plane?

An inclined plane is a simple machine that is a flat surface that is angled or slanted, allowing for an easier way to move objects from one point to another. It is often used to reduce the amount of force needed to move an object.

How does an inclined plane work?

An inclined plane works by decreasing the amount of force required to move an object by increasing the distance over which the force is applied. This works based on the principle of work, which states that the amount of work done on an object is equal to the force applied multiplied by the distance over which the force is applied.

What is the relationship between work and force on an inclined plane?

The relationship between work and force on an inclined plane is that the amount of work required to move an object up an inclined plane is equal to the force applied multiplied by the distance the object was moved. This means that the longer the inclined plane, the less force is required to move the object.

How does the angle of the inclined plane affect the amount of force required to move an object?

The angle of the inclined plane affects the amount of force required to move an object because it determines the height and length of the inclined plane. The steeper the angle, the shorter the distance the object needs to be moved, but the more force is required to move it.

What other factors can affect the amount of force required to move an object on an inclined plane?

Other factors that can affect the amount of force required to move an object on an inclined plane include the mass of the object, the friction between the object and the inclined plane, and any external forces acting on the object such as air resistance or gravity. These factors can either increase or decrease the amount of force needed to move the object on the inclined plane.

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