Topic: physics question

[grumpy]

All else being equal, is the force necessary to move the weight the same if a rope is attached to point A vs. point B?


just eyballing it, it seems like there would be an inverse relationship between the force and the distance the weight must move
IE at point A the weight must travel farther than at B for each degree of arc the lever is moved, hence the force required at B would be less since it ain't moving as far... or something... maybe...

[eigenvector]

That seems like a reasonable assumption.

Be easier to understand with a decent example though.  Mind you - if the weight tips at all, there's more to this.

[jgger]

No. Point B would make the lever longer and give more leverage. But it would move the weight a shorter distance.

[Gene]

It depends on the balance of weight in the "weight" square. Balance at the top?" bottom? How do the 2 ropes attach to the weight? There are a lot of questions unanswered to be able to answer your question.

[grumpy]

It depends on the balance of weight in the "weight" square. Balance at the top?" bottom? How do the 2 ropes attach to the weight? There are a lot of questions unanswered to be able to answer your question.

northern hemisphere, a Tuesday in May, standard temperature and pressure.

That's why the caveat "all else being equal". The only thing changing is the attachment point. Assume all other confounds are completely controlled. 

[grumpy]

how about this?

 

[madmtnmotors]

No. Point B would make the lever longer and give more leverage. But it would move the weight a shorter distance.

This. Same for both examples.

[754]

B will move it with less effort, and move it less distance.

[BomberMann650]

Screw the rope, I'm using the bulldozer with hydraulic winch and cable!

[Don R]

 B gives more leverage then A so it will move easier but not as far.

 My Niece's husband told her a full tire weigh 32 lbs. more than a flat tire because the full one has 32 lbs of air in it.

[madmtnmotors]

B gives more leverage then A so it will move easier but not as far.

 My Niece's husband told her a full tire weigh 32 lbs. more than a flat tire because the full one has 32 lbs of air in it.

That's a good one. 

I've also been told that when water pipes are full of water they don't weigh any more than pipes that are empty because the water is moving...