Calculating Net Force on 2kg Mass Down 8m Incline

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Homework Help Overview

The problem involves a 2kg mass sliding down an 8m inclined plane, starting from rest and taking 0.50 seconds to do so. Participants are tasked with calculating the net force acting on the mass along the incline.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss using motion formulas to find acceleration and suggest drawing free body diagrams to analyze forces. There are questions about kinematic equations and the correct application of formulas. Some express uncertainty about the equations needed and seek clarification on basic concepts.

Discussion Status

The discussion is ongoing, with participants exploring various approaches to understand the problem. Some guidance has been offered regarding the use of kinematic equations, but there is no consensus on the specific steps to take. Participants are actively questioning their understanding and seeking further explanations.

Contextual Notes

There is mention of limited notes and a lack of diagrams, which may affect participants' ability to visualize the problem. Some participants express frustration with their teacher's support, indicating a challenging learning environment.

NickS606
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Homework Statement



A 2kg mass starts from rest and slides down an inclined plane 8.0X10m long in 0.50s. What net force is acting on the mass along the incline?

Homework Equations





The Attempt at a Solution



I don't even know where to begin.
 
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This is an accelerated motion problem. Use a motion formula to find the acceleration.
 
Try drawing a free body diagram and then sum the forces on the body.
 
I'm sorry I am still new, can I get a better explanation please?
 
NickS606 said:
I'm sorry I am still new, can I get a better explanation please?
Can you work out the acceleration of the object?
 
How can I do that?
 
NickS606 said:
How can I do that?
Do you know any Kinematic (SUVAT) equations?
 
I'm just going to go ahead and say I have never even heard of those equations.
 
NickS606 said:
I'm just going to go ahead and say I have never even heard of those equations.
Really? Then I'm going to go ahead and say take a look in your textbook or class notes and find them.

Alternatively, you can find them https://www.physicsforums.com/showpost.php?p=905663&postcount=2". However, I must say that I will be extremely surprised if your teacher hasn't mention them, but set you a homework that requires them.
 
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  • #10
Ya I don't really recall those. Anyways, would I do [tex]a_{ave} = \Delta v / \Delta t[/tex]

I did 12N/3.5s and my answer is 3.4, is this correct?
 
  • #11
NickS606 said:
Ya I don't really recall those. Anyways, would I do [tex]a_{ave} = \Delta v / \Delta t[/tex]
Perhaps, but we'll have to do some work first.
NickS606 said:
I did 12N/3.5s and my answer is 3.4, is this correct?
No. Did you just pluck those numbers out of thin air?

Returning to the question, what do the dimensions 8x10m refer to? Height and width or height and hypotenuse or width and hypotenuse? Do you have a diagram?
 
  • #12
I got the numbers out of the question, and there is no diagram, it is height and width for sure though.
 
  • #13
NickS606 said:
I got the numbers out of the question, and there is no diagram, it is height and width for sure though.
Okay. Have you looked for the kinematic equations in your notes or text?
 
  • #14
Well there aren't many notes and all I could find was this equation [tex]v_{ave} = \Delta x / \Delta t[/tex]

The teacher isn't really that great and won't help much, that's why I am here.
 
  • #15
NickS606 said:
Well there aren't many notes and all I could find was this equation [tex]v_{ave} = \Delta x / \Delta t[/tex]
Okay, well we cannot use that equation. Try reading http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html" and see if it jogs your memory.
 
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  • #16
I'm just not getting it, I assume the equation to be used is

d=vi*t+1.5*a*t^2
 
  • #17
NickS606 said:
I'm just not getting it, I assume the equation to be used is

d=vi*t+1.5*a*t^2
The highlighted coefficient should be 0.5 rather than 1.5, but yes, this is the equation to use. Can you start filling in the known variables?
 
  • #18
Yes, that formula will do it if the initial velocity is zero.
 
  • #19
Is it d=0*.50s+.5*a*.50s^2

I put a for acceleration because I don't know what acceleration is :/
 
  • #20
Delphi51 said:
Yes, that formula will do it if the initial velocity is zero.
One may use the above formula even if the initial velocity is non-zero.
NickS606 said:
Is it d=0*.50s+.5*a*.50s^2

I put a for acceleration because I don't know what acceleration is :/
Acceleration is what you want to find out! You need to solve for the acceleration.

Now, what about the distance traveled?
 

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