Moving object on a moving slope

  • #1
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Homework Statement



Hello
Our teacher asked us today,to figure out,what the effect would be if the generic slope we use in most exercises would move too.That means,a mass m is sliding downwards to the right from a slope that is moving to the left.
So,I don't want you guys to solve my home work for me,but I hoped to find here some keywords for things I have to look up.I honestly don't know what to google to solve this problem.
Thank you!

Homework Equations




The Attempt at a Solution

 

Answers and Replies

  • #2
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what kind of effect would you want? observations? or identify all forces? make it clear.
 
  • #3
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what kind of effect would you want? observations? or identify all forces? make it clear.
hello cheah10!
She didn't specify,would you kindly provide me with keywords for both?thanks!
 
  • #4
105
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If you are asking for the affecting forces ,,
They will be as the following :
the components of the gravitational force acting on the mass + the normal force on the mass from the moving slope + the frictional force .
The resultant acceleration of the net forces is measured relatively to the movement of the moving slope if it goes with an acceleration , if the moving slope has a constant speed , "no acceleration" the resultant acceleration might be measured like the static slope.

I think that might be a reasonable intuition but I'm not very sure.
 
  • #5
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ok, I'll guide you from here. 1st, tell me, what are all the forces you can identify? Maybe it's better if you draw a free body diagram for both the slope and the mass, and upload it here.
 
  • #6
haruspex
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It depends why the slope is moving. I would guess that the idea is the slope consists of a wedge which can slide on surface of a different angle (usually horizontal). It might help to start with an extreme case. What if the wedge is much lighter than the mass on it and there's very little friction?
 
  • #7
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It depends why the slope is moving. I would guess that the idea is the slope consists of a wedge which can slide on surface of a different angle (usually horizontal). It might help to start with an extreme case. What if the wedge is much lighter than the mass on it and there's very little friction?
I understood that the slope is moving in a direction against to the motion of the object moving on it. not in a vertical motion , Where in the question did he specify that ?

|Thanks|
 
  • #8
haruspex
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I understood that the slope is moving in a direction against to the motion of the object moving on it. not in a vertical motion ,
I didn't suggest the wedge was moving purely vertically. As I wrote, it's probably to be considered as moving horizontally, but it could be more general.
As for 'against', it depends what you mean by that. In most such problems, the wedge is moving only because of the normal force from the mass. So, yes, it moves in the opposite direction to the mass's horizontal motion, but I wouldn't describe that as 'against' it.
 
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