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Chapter 9: Q5 CQ (page 314)

Mechanics sometimes put a length of pipe over the handle of a wrench when trying to remove a very tight bolt. How does this help? (It is also hazardous since it can break the bolt.)

Short Answer

Expert verified

The mechanics attach an extra length of pipe over the handle of the wrench, to increase the torque on the bolt.

Step by step solution

01

Rotational motion

The rotational motion depends on the torque and the torque depends on the applied force and the perpendicular distance between the point of application of the force and the point of rotation.

02

The wrench torque

The torque for the wrench shown in the diagram is,

τ=rFsinθ

Here, θis the angle between the force and the radius of rotation.

03

Explanation

If the length of pipe attached to the end of the wrench, the effective length that is the radius of rotation increases. Thus the same magnitude of force can provide a larger torque.

Hence, the mechanics attach an extra length of pipe over the handle of the wrench, to increase the torque on the bolt.

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Most popular questions from this chapter

Question: (a) What force should the woman inFigure 9.45exert on the floor with each hand to do a push-up? Assume that she moves up at a constant speed. (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.75cm, and she exerts force on the floor at a horizontal distance of 20.0cm from the elbow joint. Calculate the magnitude of the force in each triceps muscle, and compare it to her weight. (c) How much work does she do if her center of mass rises 0.240m? (d) What is her useful power output if she does 25pushups in one minute?

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Question: Unreasonable Results

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