Calculating Forces on a Crate on a Frictionless Ramp

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Homework Help Overview

The problem involves calculating the forces acting on a crate being pushed up a frictionless ramp at a constant speed. The crate has a mass of 210 kg and the ramp is inclined at an angle of 26.0°.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to find the normal force using the gravitational force and the angle of the ramp but encounters difficulties. Some participants suggest considering all forces acting on the crate and applying equilibrium conditions.

Discussion Status

The discussion is ongoing, with participants clarifying the forces involved and confirming the original poster's understanding of the forces acting on the crate. There is no explicit consensus yet, but guidance has been offered regarding the need to consider multiple forces.

Contextual Notes

The original poster's approach assumes a specific relationship between the forces that may not hold due to the presence of the horizontal force. The discussion highlights the importance of analyzing all forces in the context of equilibrium.

1stcool
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please help me with this phy problem, thx

In Figure 5-39, a crate of mass m = 210 kg is pushed at constant speed up the frictionless ramp ( = 26.0°) by a horizontal force F.

http://www.webassign.net/hrw/hrw7_5-39.gif

What is the magnitude of the force exerted by the ramp on the crate?




I use m*g to find Fg, and then using Fg*cos⊙(26) to find Fn(normal Force) but I got it wrong, can anybody help me, thx.
 
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The normal force would be [itex]mg cos\theta[/itex] only if there were no horizontal force F. Instead, consider all the forces acting on the crate (I see three) and apply the conditions for equilibrium.
 
three? is it Fg, F and Fn?
 
1stcool said:
three? is it Fg, F and Fn?
That's correct.
 
Doc Al said:
That's correct.
ok, thanks Doc Al
 

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