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Chapter 4: Q22CQ (page 160)

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.

Short Answer

Expert verified

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

Step by step solution

01

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.

02

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 angleθ shown in the figure, the magnitude of the force can be increased because as the value of θ is increased 0°to90°, the value of sinθalso increases.

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

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Most popular questions from this chapter

Integrated Concepts

A 2.50-kg fireworks shell is fired straight up from a mortar and reaches a height of 110 m.

(a) Neglecting air resistance (a poor assumption, but we will make it for this example), calculate the shell’s velocity when it leaves the mortar.

(b) The mortar itself is a tube 0.450 m long. Calculate the average acceleration of the shell in the tube as it goes from zero to the velocity found in (a).

(c) What is the average force on the shell in the mortar? Express your answer in newtons and as a ratio to the weight of the shell.

A cleaner pushes a 4.50-kg laundry cart in such a way that the net external force on it is 60.0 N. Calculate the magnitude of its acceleration.

A 63.0 kg sprinter starts a race with an acceleration of 4.20 m/s2. What is the net external force on him?

How are inertia and mass related?

Consider the baby being weighed in Figure 4.34.

(a) What is the mass of the child and basket if a scale reading of 55 N is observed?

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(c) What is the tension T2 in the cord attaching the scale to the ceiling, if the scale has a mass of 0.500 kg?

(d) Draw a sketch of the situation indicating the system of interest used to solve each part. The masses of the cords are negligible.
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