Calculating Net Work with Friction on a Long Shish Kebab Delivery

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Homework Help Overview

The problem involves calculating the net work done on a cart delivering meat and vegetables along an 881.0 m long skewer, considering both the applied force and friction. The applied force is 40.00 N at an angle of 45.00° above the horizontal, while the friction force opposing the motion is 28.00 N.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the appropriate formula for calculating net work, with some suggesting the use of Wnet = Fnet(d)(Cos). Questions arise about how to determine the effective force in the direction of motion and how to incorporate the friction force into the calculation.

Discussion Status

Participants are actively engaging with the problem, clarifying the need to resolve the angle of the applied force and its component in the direction of motion. There is acknowledgment of the necessity to account for friction when calculating net work, indicating a productive direction in the discussion.

Contextual Notes

There is a focus on ensuring the correct interpretation of forces involved, particularly distinguishing between the total applied force and its effective component along the direction of motion. Participants are also considering the implications of friction on the net work calculation.

duckywucky
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Homework Statement



The longest shish kebab ever made was 881.0 m long. Suppose the meat and vegetables need to be delivered in a cart from one end of this shish kebab’s skewer to the other end. A cook pulls the cart by applying a force of 40.00 N at an angle of 45.00° above the horizontal. If the force of friction acting on the cart is 28.00 N, what is the net work done on the cart and its contents during the delivery?

Homework Equations





The Attempt at a Solution



Would i use the formula: Wnet = Fnet(d)(Cos)? If so, then what do i look for?!
 
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Since the force applied is constant, it is a simple equation of W=F*d. You do need to be careful that you are using the correct force. Remember that you need the force in the direction of motion.
 
So how would i set up the formula?
W = (40.0N)(...)
 
It is not 40N because that is the force at 45 degrees to the direction of motion. You want the force in the direction of motion. So first you need to find whether you multiply 40 by sin or cos. Which one gives you the x component? Then multiply by the distance you need to travel.
 
Okay, that helps!
What would i do with the friction force?!
 
duckywucky said:
Okay, that helps!
What would i do with the friction force?!
The problem is asking for the NET work done. That includes the work done by ALL forces. Calculate the work done by ALL forces to find the net work done.
 
Sorry. I missed the part about the friction. In which case, do what PhantomJay said.
 

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