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# Inquiry: Boom/Chain Problems

## Procedure:

• To begin make sure the boom is at a 90 degree angle with the upright support.

• A pulley will be attached to the middle of the boom to give the boom more weight.

• Draw the FBD. ( boom=94.3 g, pulley=101.7g, mass=1000g)

• Calculate all remaining forces on the FBD.

• Measure the chain force and the force acting ALONG the boom.

• Compute % errors. Your calculated values will be the theoretical values.

• Repeat the experiment but change the angle from 90 degrees.

• Boom Chain problems are greatly simplified if we assume the mass of the boom is negligible and the only mass is on the end.

## Inquiry Questions:

1.) A boom/chain is setup as shown below, where angle RPS is 37.0 degrees. The weight (W) is 1730 N and the uniform mass boom weighs 762 N.

a.) What is the tension force in the chain?

b.) What is the force by the pole acting on point R and at what angle is it working with respect to straight down the boom?

2.) A boom/chain is setup as seen below. Angle SRP is 60.0 degrees, angle RPS is 80.0 degrees. The weight (W) is 1960 N and the uniform mass boom weighs 1220 N.

a.) What is the tension force in the chain?

b.) What is the force by the pole acting on point R and at what angle is it working with respect to straight down the boom?

3.) The wrecking ball below has a weight of 4800 N and the uniform boom weighs 3600 N.

a.) Calculate the tension in the support cable?

b.) What is the magnitude of the force exerted on the lower end of the boom by the hinge at point P and what is the direction with respect to directly down the boom?