Work Up an Incline: Calculate Gravity, Friction & Push Work

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The discussion revolves around calculating the work done on a 50 kg box being pushed up a 25-degree incline to a height of 45 m, considering kinetic friction with a coefficient of 0.4. Participants are uncertain about the appropriate distance to use for calculations, debating whether to use the vertical height of 45 m or the hypotenuse of the incline. It is clarified that for potential energy changes, the height difference is used, while for friction, the distance along the incline should be considered. The work done by gravity is defined as the change in potential energy, calculated using the formula m*g*h. The conversation emphasizes the importance of understanding the context of distance in work calculations.
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Homework Statement


A 50 kg box is being pushed up an incline of 25 degrees, to a total height of 45 m. Kinetic friction between the box and the incline has a mew of .4.
a) What is the work done by gravity?
b)What is the work done by friction?
c) What is the work done by the person pushing the box.



Homework Equations


W = Fd


The Attempt at a Solution


For all of the parts, I am not sure what to use as my d. Do I use 45, or do i use (45/sin(45)), the hypotenuse and the distance that the box actually slides?
 
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keemosabi said:

Homework Statement


A 50 kg box is being pushed up an incline of 25 degrees, to a total height of 45 m. Kinetic friction between the box and the incline has a mew of .4.
a) What is the work done by gravity?
b)What is the work done by friction?
c) What is the work done by the person pushing the box.

Homework Equations


W = Fd

The Attempt at a Solution


For all of the parts, I am not sure what to use as my d. Do I use 45, or do i use (45/sin(45)), the hypotenuse and the distance that the box actually slides?

For changes in PE it's straight height difference.

For friction it's distance along the incline.
 
LowlyPion said:
For changes in PE it's straight height difference.

For friction it's distance along the incline.
What about the work done by gravity? Is that height or distance on the incline? Or does it not matter.
 
keemosabi said:
What about the work done by gravity? Is that height or distance on the incline? Or does it not matter.

Work by gravity is change in PE = m*g*h
 

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