Calculating Horizontal Force on a Frictionless Ramp: A 100kg Crate Problem

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Homework Help Overview

The problem involves calculating the horizontal force required to push a 100kg crate up a frictionless ramp inclined at 30 degrees. The original poster presents their calculations for gravitational forces acting on the crate and seeks assistance in determining the necessary horizontal force and the force exerted by the ramp.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the gravitational forces acting on the crate, including both parallel and perpendicular components. They express uncertainty about the next steps in solving the problem.

Discussion Status

Some participants have offered guidance, indicating that the horizontal force must equal the parallel component of the gravitational force acting down the ramp. There is an emphasis on the importance of engaging with the problem before seeking help, suggesting a focus on the learning process.

Contextual Notes

Participants highlight the need for the original poster to engage with the problem-solving process and to understand the underlying concepts before relying on external assistance.

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Homework Statement


A 100kg crate is pushed at a constant speed up a frictionless 30 degree inclined ramp. What constant horizontal force is required? what force is exerted on the crate by the ramp?


Homework Equations


Fg parallel= mgsin(theta), Fg Perpindicular=mgcos(theta), Constant speed-->a=0m/s2


The Attempt at a Solution


Fg=mg
=9.8x100
=980N
Fg parallel=980sin(30)
=490N

Fg perpindicular= 980cos(30)
=849N

I have no idea what to do next! Please help me out here if you can! Any contribution appreciated!
 
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Welcome to PF, Evil!
The push must equal the parallel (down the ramp) component.
The block pushes on the ramp (straight in) with the perpendicular component. No more calcs to do!
 
Thanks for the welcome! And the guidance on this question! Looks like these forums could come in really handy in the next little while!
 
Indeed! Be sure you don't miss out on the struggle part - give it a darn good try yourself before posting. We're here to save you from wasting time but we must not prevent you from learning in the struggle.
 

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