Calculate Friction & Coefficient: Force w/Angle & Mass 5kg at Rest

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Homework Help Overview

The problem involves a block of wood with a mass of 5 kg resting on a horizontal surface. The scenario describes the forces acting on the block as it is pulled with a spring scale, noting the forces at the point of impending motion and during sliding.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the use of free body diagrams and equations related to force, mass, and friction. There are attempts to relate the applied forces to the normal and frictional forces, with some questioning how to determine friction without knowing the coefficient.

Discussion Status

Participants are exploring various approaches to understand the relationships between the forces involved. Some have suggested using equations and free body diagrams, while others have provided insights into the normal force and frictional force based on the readings from the spring scale. There is no explicit consensus on the methods to be used.

Contextual Notes

Participants are operating under the constraints of a homework problem, which may limit the information available for solving the problem. The discussion includes varying interpretations of how to incorporate the angle and the implications of the forces measured by the spring scale.

iskinny
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sorry for not using the forum

but a block of wood he's a mass of 5Kg is at rest on a horizontal surface. a spring scale is slowly pulled until the block just begins to move. at this point a reading on the scale is 29N. after the block starts sliding the reading on the scale is 23N.
A) what is the normal foce?
B)what is the frictional force?
C) what is the coefficient for static and kinetic friction on the horizontal?

what is the answer and how do you get the friction without the coefficeint?
 
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try using the equations and draw a free body diagram

F=ma

F=Force Applied
m=Mass
a=Acceleration

F=uN

F=Force of Friction
u=Coefficient of Friction
N=Normal Force
 
Normal equals mass x acceleration, frictional equals co of friction times normal, and then use both answers and f+ma as well as F=uN to find frictional force. Angle comes into play with horizontal plane.
 
Gravitational force equals the normal force on horizantal surfaces. Use that and the fact that it took 29N to break friction. At that point the applied force and frictional force is equal so frictional force is 29N. use that to find the coefficient. Same for the other one except with 23N
 
firstly draw out your problem

from their create a free body diagram showing all the forces that are acting and you will most likely be using force and frictional equations such as F=ma and F=uN
 

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