Homework Question: Forces on an incline

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Homework Help Overview

The discussion revolves around a physics problem involving forces acting on an object on an incline. The object has a mass of 10.0 kg and is released from a height of 1.00 m on a 15.0 degree incline. The problem seeks to determine the constant frictional force acting on the object as it moves down the incline, given its speed at the bottom.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the use of force diagrams and the balance of forces in the x and y directions. There is mention of calculating net force using initial and final velocities, as well as displacement. Some participants express confusion about the relevance of velocity to the problem and the approach to finding the frictional force.

Discussion Status

The discussion is ongoing, with participants attempting to clarify their understanding of the forces involved. Some guidance has been offered regarding focusing on forces along the incline and using known values to calculate the frictional force. There is no explicit consensus on the approach yet.

Contextual Notes

Participants are working under the constraints of a homework assignment, which may limit the information they can use or the methods they can apply. There is uncertainty regarding the relationship between velocity and the calculation of frictional force.

Heatherfeather4
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A 10.0 kg object is released from the top of an incline with a height of 1.00m. The incline makes a 15.0 degree angle with the horizontal. If the speed of the object is measured to be 3.00m/s at the bottom of the incline, what was the constant frictional force (Fk) along the incline?

I have tried everything I can think of to solve this but cannot find the correct solution. The given answer was -13.7N.

I started with a force diagram and then I tried setting the x and y forces equal to zero and solving for that but got lost. Any help would be appreciated!
 
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Post them here.
 
Post what here?
 
Your workings.
 
Heatherfeather4 said:
A 10.0 kg object is released from the top of an incline with a height of 1.00m. The incline makes a 15.0 degree angle with the horizontal. If the speed of the object is measured to be 3.00m/s at the bottom of the incline, what was the constant frictional force (Fk) along the incline?

I have tried everything I can think of to solve this but cannot find the correct solution. The given answer was -13.7N.

I started with a force diagram and then I tried setting the x and y forces equal to zero and solving for that but got lost. Any help would be appreciated!
You have initial and final velocity as well as the displacement. Can you find the net force on the object?
 
Here is the work. I do not understand how this would help find Fk and I do not understand where the velocity has to do with this problem.
 

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Heatherfeather4 said:
Here is the work. I do not understand how this would help find Fk and I do not understand where the velocity has to do with this problem.
Just focus on the forces along the incline. The velocities and displacement will help you find the net force (along the incline). From the diagram, you can write the equation for the net force and plug in the values known to you to calculate the frictional force.
 
The object is subject to constant force thus constant acceleration.
You know the length traveled and both initial and final velocity.
 

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