Physics, Torque (10 of 13) Static Equilibrium, Hanging Sign at an Angle No. 4

Shows how to use static equilibrium to determine the tension in the cable supporting the beam from which the sign is hanging. To solve this problem we will set the sum of the torques equal to zero and solve for the force in the cable.

Torque is a rotating force. It is a measure of how much force is acting on an object that causes the object to rotate. The object will rotate about an axis, which is called the pivot point. It is labeled with the letter P or O. The distance from the pivot point to the point where the force acts is called the moment arm or the lever arm. This distance is labeled with the letter r. This distance r is also a vector, and points from the axis of rotation to the point where the force acts. The force is labeled with the letter F.

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[stepbystepscience]

New video, static equilibrium and the sign hanging at an angle.

[Shackled]

This was quite tough having never done this particular one before. Great learning experience to look out for. Thank you!

[ryank]

Thank you very much, this helped clear up a lot of what I was missing from my lectures, esp how to find the correct angle of the force applied

[konradbrochocki]

i understand the principle of why you chose the angle, but i receive the same components if i use the angle 53 degrees instead of the 127. just thought this simplified things a bit. is there any cases where i couldn't use this principle? very good videos btw. i like how you have multiple vids covering the same topic with different example problems. i subscribed.

[McFlurry]

Why has the tension force of the cable that is holding the sign been omitted in this problem?

[Bettadenyou]

Can you explain why we want to use 6.30 as our "R" and not the length of the beam to where the cable attaches.. aka 6.30/sin(53)?

[George-cbrj]

when you used the angles 127 degrees, could you not have just used 53 degrees? Because it still gives you the same answer. Its the same with the 143 degree angle, could you have used 37 degrees?
Thanks

[morphanok]

What if the cable is at an angle, say 60 or so degrees from the wall? What do you do then?

[Lionfang]

is the normal force produced to counter gravity not relevant in this ?

[seangray]

I did it like this:
(117.6 * 3.75 * cos37)+(210.7 * 7.5 * cos37)=3.79T
Therefore T=426N
I used * for multiplication, because I don't have a multiply button.

[ahmadbelhaj]

you messed it up by plugging the number, had you just kept in term of variables, it would have been greate . I watched it 5 times, and I still did not get how did you sovle for torque by the cable. what is the TorqueC is it Fc*sin37? or what is the purpose of143 is equal to

[csnefu]

How come you were so fast in this turorial

[dianevojnovic]

can you explain why you used torque? Im confused when to use it in a hanging sign problem.

[RealSmiller]

What about tension force and normal force