Channel-lock pliers hold a round metal bar as a machinist grips the handles with P = 50 N (Figure P4.21).

Channel-lock pliers hold a round metal bar as a machinist grips the handles with P = 50 N (Figure P4.21). Using the free body diagram shown for the combined lower jaw and upper handle, calculate the force A that is being applied to the bar.

Figure P4.21

130 mm 20 mm C B D B, A Bx

Expert Solution

Draw the free body diagram of lower jaw of the channel-lock pliers.

Consider the equilibrium of moments about B.

ΣMB = 0

A(20) = P(130)

Here, A is the unknown force that is being applied to the bar and P is the force applied at the handle.

Substitute 50 N for P.

A(20) = (50) (130)

A = 325

Therefore, the force A that is being applied to the bar is 235 N.

Junaid answered 2 years ago

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