# Torque Rigid Beam: Find Force Applied by Support 2

• mailmas
In summary, a rigid beam with a length of 4.00 m and a mass of 50.0 kg is supported at either end by resting on the supports. A 65.0 kg person stands 3.00 m from one support. Using the equation for torque, the force applied by the other support is calculated to be 723.5N. However, upon checking, the correct answer is 405N, indicating a possible mix up in the problem.
mailmas

## Homework Statement

A rigid beam with a length of 4.00 m has a mass of 50.0 kg and a uniform mass distribution. It is supported at either end as seen in the figure by resting on the supports, but is not attached to them. If you call the support on the right support 2 and the support on the left support 1, a 65.0 kg person stands 3.00 m from support 1. Solve for the force applied by support 2.

T=F*r

## The Attempt at a Solution

Taking support 1 as pivot point:
Sum of Torques = 0 = Fnorm(4) - (50)(9.81)(2) - (65)(9.81)(3)
Fnorm(4) = (50)(9.81)(2) + (65)(9.81)(3)
Fnorm = (981 + 1912.95)/4
Fnorm = 723.5N but the answer says 405N.

I cannot see the figure that you refer to. Can you post it?

kuruman said:
I cannot see the figure that you refer to. Can you post it?
Sure.

#### Attachments

• Screen Shot 2018-05-09 at 8.09.00 PM.png
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Thanks. Your answer for the diagram you have is correct. If you solve for the force at the other end, you will get 405 N. There must be a mix up somewhere. It makes sense that the larger force is at the end closer to the person.

kuruman said:
Thanks. Your answer for the diagram you have is correct. If you solve for the force at the other end, you will get 405 N. There must be a mix up somewhere.
Just calculated it for the other side and got 405. Thanks for the help.

## 1. What is torque?

Torque is the measure of how much a force acting on an object causes that object to rotate.

## 2. How is torque calculated?

Torque is calculated by multiplying the force applied to an object by the distance from the pivot point to the point where the force is applied.

## 3. What is a rigid beam?

A rigid beam is an object that does not bend or deform when a force is applied to it. It remains in its original shape and size.

## 4. What is the purpose of finding the force applied by support 2 in a torque rigid beam problem?

The force applied by support 2 is necessary to determine the equilibrium of the beam. It helps determine the balance between the forces acting on the beam.

## 5. Are there any other factors that affect torque in a rigid beam?

Yes, the angle at which the force is applied and the weight of the beam itself can also affect the torque in a rigid beam problem.

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