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Found in: Page 160

### College Physics (Urone)

Book edition 1st Edition
Author(s) Paul Peter Urone
Pages 1272 pages
ISBN 9781938168000

# In a traction setup for a broken bone, with pulleys and rope available, how might we be able to increase the force along the femur using the same weight? (See Figure 4.30.) (Note that the femur is the shin bone shown in this image.

The force can be increased or decreased using the same weight using pulleys and ropes.

See the step by step solution

## The tension in the rope is equal to the weight of the leg.Step 1: Concept of Normal Force

Whatever supports a load, it must supply an upward force equal to the weight of the load. This upward force is called the normal force.

## Step 2: Determine the tension in the rope

Referring to figure 4.30, the traction setup shown helps in increasing the force across the broken bone using ropes and pulleys. By changing the angle${}^{\mathrm{\theta }}$ shown in the figure, the magnitude of the force can be increased because as the value of ${}^{\mathrm{\theta }}$ is increased ${}^{0°\mathrm{to}90°}$ , the value of ${}^{\mathrm{sin\theta }}$ also increases.

Hence, the force can be increased or decreased using the same weight.