How does weight influence static and knetic friction?

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Homework Help Overview

The discussion revolves around the influence of weight on static and kinetic friction, particularly in the context of an experiment involving a spring balance used to measure the force required to move an object horizontally. Participants express confusion regarding the relationship between mass, weight, and friction in this setup.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants question the purpose of the experiment and how weight affects friction. Some explore the relationship between the force needed to move objects of different weights and the coefficients of friction. Others inquire about the implications of pulling the mass at a steady speed and the forces involved.

Discussion Status

There is an ongoing exploration of the concepts involved, with some participants providing insights into the relationship between weight and friction. However, confusion remains about the specific role of mass and weight in the experiment, indicating that further clarification may be needed.

Contextual Notes

Participants mention the potential for varying the mass-to-weight ratio under different conditions, such as altitude changes or additional forces, which may impact the experiment's outcomes.

musi
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we pulled an object using a spring balance {horizontally} what where we measuring with the spring balace? where does mass and weight come in? would my aim be to determine whether weight will have an effect
on static or kinetic friction? i am just confused with this whole thing! what is the point of this expiremnent?



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The Attempt at a Solution

 
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would my aim be to determine whether weight will have an effect on static or kinetic friction?
Welcome to PF.

The answer is yes.

The aim is to determine the force needed to move different weights.

The ratio of the force required divided by the weight is your coefficient of friction. That's what they want you to determine.
 
Weight will have an effect on friction as the friction force is the friction coefficient * the normal force. Remember static and kinetic coefficiants are different (kinetic coefficient is lower).

If you only pulled 1 block, then the aim is to get you to see that the coefficients are different. If you pulled multiple blocks then the aim was to determine the effect of weight.
 
Welcome to PF!

musi said:
we pulled an object using a spring balance {horizontally} what where we measuring with the spring balace? where does mass and weight come in? would my aim be to determine whether weight will have an effect
on static or kinetic friction? i am just confused with this whole thing! what is the point of this expiremnent?

Hi musi! Welcome to PF! :smile:

Was this mass pulled at a steady speed (when it was moving)?

If so, then, both when it was stationary and when it was moving, the only horizontal forces on it were the pulling force and the friction force.

By good ol' Newton's second law, they have to be equal, and by his third law the pulling force has to equal the force on the spring (as shown on the spring's scale)

Though I don't understand where the difference between mass and weight came into the experiment … unless you could alter the ratio of mass to weight (say, by going to a mountain-top, or by attaching helium balloons to the mass). :confused:
 
Oh okay. thank you i get it now.
 

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