Velocity of sliding object


by vic05
Tags: friction force, normal force, sliding block
vic05
vic05 is offline
#1
Feb20-13, 02:07 AM
P: 2
1. The problem statement, all variables and given/known data
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?


2. Relevant equations

kineticFriction force = coefficient of friction X normal Force

normal Force = force of gravity + mass*acceleration

3. 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
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Basic_Physics
Basic_Physics is offline
#2
Feb20-13, 02:20 AM
P: 358
The normal force and the component of the weight of the block need to cancel each other out.
vic05
vic05 is offline
#3
Feb20-13, 02:26 AM
P: 2
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]

Basic_Physics
Basic_Physics is offline
#4
Feb20-13, 06:33 AM
P: 358

Velocity of sliding object


Physics not about memorizing formulas, it is about deriving them from first principles, so can you?


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