Find the magnitude of a block pulling a 200 lb block

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Homework Help Overview

The discussion revolves around determining the magnitude of a pulling force required to move a 200 lb block up an incline at a specified angle and acceleration, while considering frictional forces.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the need to analyze forces acting on the block, including weight, friction, and the normal force. Questions arise about how to calculate the pulling force and the relationship between forces and acceleration.

Discussion Status

Participants are actively exploring the forces involved and their relationships, with some guidance provided on the need to balance forces in both the x and y directions. There is an acknowledgment of multiple forces at play, but no consensus on the next steps has been reached.

Contextual Notes

Participants are working under the constraints of a homework problem, which may limit the information available and the methods they can use to approach the solution.

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Help Please!

I have to find the magnitude of a block pulling a 200 lb block up a plane of angle 30 degrees with an acceleration of 4.0425 ft/s^2, the coefficient of kinetic friction is 0.2. Where should I start?
 

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The sum of all of the forces acting on the block in the direction of the incline need to be equal to its mass times its acceleration.
 
ok so for the x and y direction EF = ma then what?
 
ok so for the x and y direction EF = ma then what?
 
You need to add the forces in the direction of the incline and divide them by the mass of the block to get the given acceleration.

The sum of the forces perpendicular to the incline need to add up to zero.
 
ok i got those, so now how do i find? the weight of the block that's pulling? the only force on it is its (mass) * (gravity)
 
There are at least four forces in operation!

The weight, friction, the required pulling force up the incline and the normal force.
 
ok, thanks for ur help
 
You first need to determine the size of the pulling force, [tex]P[/tex], on the block on the incline in order to solve the problem.
 

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