How Do You Calculate Mass and Frictional Force in Physics Problems?

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Homework Help Overview

The discussion revolves around calculating mass and frictional force in a physics problem involving a box subjected to an applied force, kinetic friction, and acceleration. The problem is situated within the context of dynamics and frictional forces.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the necessity of a free-body diagram and the relationships between the forces acting on the box. There is an emphasis on determining the normal force and its dependence on the mass, which remains unknown.

Discussion Status

The conversation is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the use of algebra to express mass in terms of other variables, but no consensus has been reached on a specific approach.

Contextual Notes

Participants note the challenge of calculating the normal force without knowing the mass, which is a critical component for determining the frictional force. The problem is framed within the constraints of a homework assignment.

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Homework Statement



A force of 400 Newtons is applied horizontally to a box. The kinetic coefficient of friction is .64 and the acceleration of the box is 4 m/s^2. Find the mass and the force of friction.

Homework Equations


assume that acceleration due to gravity or g=10 m/s^2

The Attempt at a Solution


please explain!
 
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Welcome to PF.
Did you draw the free-body diagram?

There should be four forces on it.
Are the forces balanced?
Are any of them related to each other?
 
yeah i drew the free body diagram and have that there are four forces but I am having trouble finding the normal force without knowing the mass since i need it to find the force of fricition
 
Write everything out as symbols - use algebra to get an equation that says "m=" a bunch of symbols. Then put the numbers in.
 

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