How Fast Does a Block Slide Down a Ramp with Friction?

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Homework Help Overview

The discussion revolves around a block sliding down a ramp inclined at 30 degrees, with a coefficient of kinetic friction of 0.4. The original poster seeks to determine the block's speed at the bottom of the ramp, focusing on the forces involved, particularly the normal force and kinetic friction.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the relationship between the normal force and the gravitational forces acting on the block. The original poster expresses difficulty in calculating the normal force necessary to determine the kinetic friction force. Others suggest that the normal force and the weight component must balance each other.

Discussion Status

Some participants have provided insights into the forces at play, and there is a mention of a formula related to acceleration that was referenced by one participant. However, there is no explicit consensus on the approach to take, and the discussion remains open with various interpretations being explored.

Contextual Notes

The original poster indicates a need for guidance in understanding the normal force and its role in the problem, highlighting a potential gap in information or understanding regarding the forces involved in the scenario.

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Homework Statement


Block slides down a 1 meter ramp at a 30 degree angle. The coefficient of kinetic friction is 0.4
what is the block's speed at the bottom of the ramp?


Homework Equations



kineticFriction force = coefficient of friction X normal Force

normal Force = force of gravity + mass*acceleration

The Attempt at a Solution



I've tried the problem but i get stuck of finding the normal force required to find the kinetic friction force. Can someone guide me a little bit please... thank you in advanced
 
Physics news on Phys.org
The normal force and the component of the weight of the block need to cancel each other out.
 
solved! the professor gave us a formula but I copied it wrong... just for reference the formula which gave acceleration was a = g[sinO - UkcosO]
 
Physics not about memorizing formulas, it is about deriving them from first principles, so can you?
 

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