anonymous
  • anonymous
PHYSICS - can someone check? Suppose you wanted to break a meter stick over your knee. The cross section of a meter stick is rectangular. Will it be easier to break with a.) the long side against your knee b.) the short side against your knee? I said it'd be easier to break the stick with the short side on your knee, since the length from the point on knee to where force is applied is greater in B than A. Is this correct?
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@ganeshie8
ganeshie8
  • ganeshie8
do you have a diagram ?
anonymous
  • anonymous
There is no diagram, just the description as written above

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ganeshie8
  • ganeshie8
|dw:1446525966976:dw|
anonymous
  • anonymous
But since we're learning torque, I assumed it had to do with the equation for torque
anonymous
  • anonymous
And since the greater the "r" the greater the torque, so I said it'd be easier for B
baru
  • baru
|dw:1446526078649:dw|
baru
  • baru
is that what ur saying is the best option?
anonymous
  • anonymous
Yeah, I said it'd be easier to break the stick with the short side against the knee
baru
  • baru
yeah what ever gives greater torque, so you want to apply force as far away from you knee as possible. but the options are phrased weirdly, i cant make out which one's which xD
anonymous
  • anonymous
I was also confused at first since I wasn't sure if "against knee" meant that you were breaking it against knee at a certain point or if you were resting it at a certain point
anonymous
  • anonymous
But I assume it means when it's resting against your knee.
baru
  • baru
ok...this has turned into an English question :p, i would go with option A |dw:1446526543111:dw|
baru
  • baru
best you draw a diagram for the answer
anonymous
  • anonymous
? But the question doesn't differentiate between along or across. It just says a) long side against your knee b.) short side against your knee So I think the diagram would look something like this |dw:1446526739033:dw|
anonymous
  • anonymous
@ganeshie8 what do you think?
anonymous
  • anonymous
Yes, if you were to place the ruler sideways across your leg, it would be easier to break. It is because of torque, but it's mostly due to the material and the moments/forces that are created.|dw:1446530469943:dw| As you can see, there are 2 moments and 2 forces that are applied over the short length that is in contact with your knee. Whereas (sideview)|dw:1446530566022:dw| in this scenario, there is only 1 moment and 1 force being applied. In order to break it, you will have to apply a larger force which will produce a larger moment in order to compensate.
anonymous
  • anonymous
@CShrix I'm pretty sure it's not asking about "across your leg" versus "alongside your leg" like how you've displayed in your diagram
anonymous
  • anonymous
@jaeuni |dw:1446537786311:dw| According to baru's drawing. It's the same as mine but a different perspective
anonymous
  • anonymous
|dw:1446538208891:dw| If the question ends up being this scenario, then yes, the right side would be easier due to more leverage. The increase in leverage/length also for a greater deflection (bending) of the stick. At the top of the stick, there would be a greater tension (stretching), and at the bottom side of the stick, there is compression (internal pushing).

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