If you are holding a 25lb weight in your hand 30cm from your elbow joint and your biceps brachii is generating a 30lb upward force at its attachment 5cm from the axis at 30° of elbow flexion, what will happen to the weight?

If you are holding a 25lb weight in your hand 30cm from your elbow joint and your biceps brachii is generating a 30lb upward force at its attachment 5cm from the axis at 30° of elbow flexion, what will happen to the weight?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 85A

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Concept explainers

Mechanical Properties of Solids

There are three types of matter- solid, liquid and gas. Out of them, solids have a rigid shaped and size. The intermolecular forces of attractions in solids are greatest. Mechanical properties are the physical properties of a material which it shows, when it is provided with certain amount of force or load. These properties are to be kept in mind for various purposes. When a force is applied to an object, the object may or may not get deformed depending upon its elastic property. But every time the object develops a restoring force against the force applied. This is commonly known as stress. If the object changes its dimensions due to the force applied it develops strain ( which is the ratio of change in dimension to the original dimension).

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In this case we have to observe all the torque acting on the body.

Let us suppose elbow join as the axis of rotation.

For better understanding, let us draw a schematic diagram as below.

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