Simple Physics Question

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M

MrCodeDude

Lifer
Jun 23, 2001
13,674
1
76
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction fource on the sled is 1000N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady 2.0m/s?

IS THE ANSWER 507.713N EACH ??
 
dullard

dullard

Elite Member
May 21, 2001
26,099
4,744
126
They each must put a 500 N force in the opposite direction than friction to maintain the velocity. But they are also pulling against each other (draw a diagram). It is a simple trig problem (one step), and the answer should be very easy.
 
M

MrCodeDude

Lifer
Jun 23, 2001
13,674
1
76
I don't get this angle between two ropes. Does it mean that they form a V and both are attached to the middle of the sled? Or is each one on each side of the sled and they are at a 20° from the ground?

And what equations should I be looking at?
 
L

Lonyo

Lifer
Aug 10, 2002
21,938
6
81
Originally posted by: inveterate
WTF... how can a LIFER not be able to do this.. this is like ... High school... stuff
Click to expand...

Because said lifer is lazy/cannot be bothered to remember HS physics/has a job which has nothing to do with physics.

But then you have to ask why he needs to answer the question, and if he is posed such a question then the only one of the above which can apply is the lazy one.
Or the OP is still in HS and has failed at learning this stuff/goes to a really poor school which has failed to teach him this stuff to a decent standard, in which case he should forget about living.
 
M

MrCodeDude

Lifer
Jun 23, 2001
13,674
1
76
Originally posted by: inveterate
WTF... how can a LIFER not be able to do this.. this is like ... High school... stuff
Click to expand...
Yes, I did this in highscool, and forgot it immediately afterwards.

And lifer has nothing to do with intelligence, it has to do with how much spare time I have to nef ;)
 
H

Howard

Lifer
Oct 14, 1999
47,982
11
81
Imagine somebody pulling a rope to drag a sled across the ground. Now, split that rope in half, give one half to each player, and make the angle between the halves 20 degrees.
 
dullard

dullard

Elite Member
May 21, 2001
26,099
4,744
126
Originally posted by: MrCodeDude
I don't get this angle between two ropes. Does it mean that they form a V and both are attached to the middle of the sled? Or is each one on each side of the sled and they are at a 20° from the ground?
Click to expand...
I read it as the bold statement. Otherwise, there isn't enough info to solve it.

 
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