Resultant forces on objects and springs

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Homework Help Overview

The discussion revolves around a physics problem involving resultant forces on an object being dragged up a slope and the interaction with a spring. The subject area includes concepts of forces, friction, and energy conservation.

Discussion Character

  • Mixed

Approaches and Questions Raised

  • The original poster attempts to identify the appropriate equations to calculate work done against friction but expresses difficulty in progressing further. Some participants suggest visualizing the problem with force vectors, while others question the need for additional forces when considering the spring.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the use of energy conservation for the spring-related question, indicating a potential direction for further exploration.

Contextual Notes

Participants are navigating through the complexities of the problem, including the implications of kinetic friction and the relationship between forces and energy in the context of the spring. There is an indication of confusion regarding the setup and assumptions related to the forces involved.

slaw155
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Homework Statement


Hi

I've been struggling to work this out over the last week, so any help would be appreciated!

1: An object of mass 400kg is dragged at a constant velocity of 0.5m/s up a rough slope inclined at 25degrees to the horizontal. Given that coefficient of kinetic friction between object and ground = 0.75, at what rate is work done against friction?

Homework Equations



1: Power = work/time

The Attempt at a Solution



I haven't unfortunately gotten past knowing what equation to use :/
 
Last edited:
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Have you drawn a picture with the individual force vectors?
 
I've tried for question 1 but don't know how to progress with it.
 
Last edited:
slaw155 said:
I've tried for question 1 but for question 2 I can't figure out how we can find the extra force exerted on the spring when the mass is pushed down on it (this force is additional to the weight of the object)
You don't need it. Part 2 is not even a force problem - try using energy conservation instead.
 

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