An owner has forgotten the combination to an old lock. In order to remove the lock, he will need to use a pair of bolt-cutters.

What is known:

A force of 45 lb is applied on each handle.

The dimensions of the bolt-cutters are:

Bolt-Cutter Dimensions

Problem Description

Question

If 45 lb of pressure on each handle is required to cut the lock, what is the total force exerted at point Q?

Approach

Use symmetry to simplify the problem.

Disassemble the tool and label the known and unknown forces acting on each segment.

Identify two-force members

Identify joints common to multiple members.

Solve using the equations of equilibrium.

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