Question

Torque is important when tightening bolts. Why is force not important?

   Torque is important when tightening bolts. Why is force not important?

Physics Principle and Problems

Physics Principle and Problems

Paul W. Zitzewitz,… 1st Edition

Chapter 8, Problem 53

Instant Answer

Solved by Expert Eric Mockensturm

08/31/2020

Step 1

Torque is a measure of the force that can cause an object to rotate about an axis. It is calculated by multiplying the force applied by the distance from the axis of rotation to the point where the force is applied. In mathematical terms, \(\tau = Show more…

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Torque is important when tightening bolts. Why is force not important?

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Key Concepts

Torque

Torque is the measure of a twisting force that causes rotation. It is calculated as the product of the applied force and the distance from the pivot or axis of rotation. In mechanical applications like bolt tightening, torque quantifies the effective rotational force, ensuring that the bolt is tightened to the correct specification for proper clamping force and safety.

Moment Arm

The moment arm, also known as the lever arm, is the perpendicular distance from the axis of rotation to the line of action of the force. It is crucial in determining the torque because even a small force can create a large torque if applied at a longer distance. This concept explains why simply knowing the magnitude of force isn’t enough to predict the rotational effect in bolt tightening.

Force Application in Rotational Systems

While force is the basic push or pull on an object, its role in rotational systems must be considered along with the distance from the pivot. In the context of tightening bolts, it is the combination of the force applied and the moment arm that produces the torque. Therefore, focusing solely on force neglects the influence of where the force is applied, making torque the critical factor.

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