Power & Kinetic Energy Needed to Pull Wagon at 25km/hr

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Homework Help Overview

The discussion revolves around a physics problem concerning the power required to pull a wagon weighing 32,200 N at a speed of 25.0 km/hr, considering a coefficient of rolling resistance of 0.200. Participants are also tasked with calculating the kinetic energy of the wagon.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the necessary equations, particularly focusing on the force of friction and its relationship to the normal force. There are questions about how to integrate concepts of acceleration with friction and how to derive power from force and velocity.

Discussion Status

The conversation is ongoing, with participants seeking guidance on finding the normal force and its implications for calculating power. Some have provided insights into the relationship between forces, but there is no explicit consensus on the approach to take.

Contextual Notes

Participants express uncertainty about the connections between different forces and the calculations required, indicating a need for clarification on fundamental concepts without providing specific solutions.

joepro
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Hello, I am having a hard time figuring out some physics problems.

The problem states.

How much power is required to pull a wagon weighingi 32200N at the speed of 25.0km/hr f the coefficient of rolling resistance is 0.200? What is the kinetic energy of the wagon?
______KW
______J

Thanks for the help!
 
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What equations do you think you will need to solve this problem?
 
I knowI need Ff=UN but otherwise I do not understand how to put the acceleration problem together with the friction problem or where to even start.
 
joepro said:
I knowI need Ff=UN but otherwise I do not understand how to put the acceleration problem together with the friction problem or where to even start.

You don't need acceleration for this problem. You can get Ff using the formula. So now how does Power relate to force and velocity?
 
My U is .200 and I know that Ff=U * normal force. How do I find the normal force, then one I find the normal force what do I do to find the required power. I just need some steps and guidence. Thanks
 
joepro said:
My U is .200 and I know that Ff=U * normal force. How do I find the normal force, then one I find the normal force what do I do to find the required power. I just need some steps and guidence. Thanks

The normal force or the normal reaction is an upward force acting on the car. The only other force acting in the vertical direction is the weight which acts downwards. So if the car does not move up or down, then what is the normal force equal to?
 

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