I would pester my physics teacher except it Saturday and theres no school. Is my drawing correct?
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Whenever any power is applied on an object, then an equally large power facing in the opposite direction is created. That's it.
So, when you're moving your mouse, there's the power of your hand, and the opposite power of mouse rubbing against the table.
But I don't know any physics terms in English...Solver, WePlayCiv Co-Administrator
Contact: solver-at-weplayciv-dot-com
I can kill you whenever I please... but not today. - The Cigarette Smoking Man
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Whenever any power is applied on an object, then an equally large power facing in the opposite direction is created. That's it .
So, when you're moving your mouse, there's the power of your hand, and the opposite power of mouse rubbing against the table.
But I don't know any physics terms in English...
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Originally posted by Solver
Whenever any power is applied on an object, then an equally large power facing in the opposite direction is created. That's it.
So, when you're moving your mouse, there's the power of your hand, and the opposite power of mouse rubbing against the table.
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Space.
How could you pull on that object in space?
Your diagram is correct. It shows that unless you have some kind of normal force, you will not be able to pull the object.
{}
XX - - - i ----> Fyou
XX ^
< ----- Ffriction.
Without friction, there would be nothing to hold the object in place so that you could start to move the object.
If you are pushing the object, both you and the object would move away from each other depending on the ratio of your masses.Scouse Git (2) La Fayette Adam Smith Solomwi and Loinburger will not be forgotten.
"Remember the night we broke the windows in this old house? This is what I wished for..."
2015 APOLYTON FANTASY FOOTBALL CHAMPION!
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Originally posted by Ben Kenobi
Without friction, there would be nothing to hold the object in place so that you could start to move the object.
If you are pushing the object, both you and the object would move away from each other depending on the ratio of your masses.One day Canada will rule the world, and then we'll all be sorry.
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BC:
In order to push the object in one direction, without pushing yourself away, you need friction. Without friction, you don't have the traction to actually push or pull.
And yes, that's a better way to put the question in terms of centre of mass. That's why when you push, the ratio of the velocities will be the inverse of the ratio of the masses.Scouse Git (2) La Fayette Adam Smith Solomwi and Loinburger will not be forgotten.
"Remember the night we broke the windows in this old house? This is what I wished for..."
2015 APOLYTON FANTASY FOOTBALL CHAMPION!
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Originally posted by Ben Kenobi
BC:
In order to push the object in one direction, without pushing yourself away, you need friction. Without friction, you don't have the traction to actually push or pull.One day Canada will rule the world, and then we'll all be sorry.
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The tissue moves because there is a net force acting on it (pull from your hand). Newton's third law tells you that whenever you act on an object (tissue) the tissue acts on you with an equal and opposite force (this is due to conservation of momentum, which is in turn due to translational symmetry of space, but that is irrelevant here). On the Earth you do not actually move when you pull on a tissue because your frictional contact with the ground stops you and the force is so tiny (the tissue being very small) that you don't notice it. In space, there would be no frictional force counteracting your tendency to move in the opposite direction of the tissue, so you would drift very slowly.
The final verdict is, for all force problems, coming from experience in dealing with freshman physics students:
1) draw a free body diagram
2) DRAW A FREE BODY DIAGRAM!
3) forces are opposite and equal
4) F=MA (vector eqn.)12-17-10 Mohamed Bouazizi NEVER FORGET
Stadtluft Macht Frei
Killing it is the new killing it
Ultima Ratio Regum
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at first I understand it just fine, and then I have to go and think about it...
You aren't making sense there, at least to me. You don't need friction to push or pull an object. The only key point in the space situation is that the centre of mass cannot move (assuming you define it as originally stationary). I always prefer to do these questions in terms of CoM and momentum.Ben almost confused me to the point of insanity, telling me the tissue cant move.
1) draw a free body diagram
That is really going to help a weak physics student...
Its becoming clearer now, thanks guys! looking at my original post Im not even sure of what I was confused about...
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A free body diagram is what you've drawn, basically. You take out a piece (the tissue, say, or you) and draw all the forces acting on it.12-17-10 Mohamed Bouazizi NEVER FORGET
Stadtluft Macht Frei
Killing it is the new killing it
Ultima Ratio Regum
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Yes, as long as you never moved your hand backwards to get the second stroke.Jon Miller: MikeH speaks the truth
Jon Miller: MikeH is a shockingly revolting dolt and a masturbatory urine-reeking sideshow freak whose word is as valuable as an aging cow paddy.
We've got both kinds
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