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Chapter 9: Q9-9Q (page 230)

Why do you tend to lean backward when carrying a heavy load in your arms?

Short Answer

Expert verified

You lean backward to keep the center of mass over your feet.

Step by step solution

01

Understanding center of mass

In this problem, the concept of center of mass will be used. The center of mass is the point on a component at which the total mass is concentrated.

02

Explanation for the backward movement of a body due to heavy load

When a particular person is carrying a heavy load, his/her body tends to move backward in order to maintain the center of mass of the body over the feet. If the center of mass of the body is in front of the feet, the person will fall forward.

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Most popular questions from this chapter

(III) A steel cable is to support an elevator whose total (loaded) mass is not to exceed 3100 kg. If the maximum acceleration of the elevator is \({\bf{1}}{\bf{.8}}\;{\bf{m/}}{{\bf{s}}^{\bf{2}}}\), calculate the diameter of the cable required. Assume a safety factor of 8.0.


When a wood shelf of mass 6.6 kg is fastened inside a slot in a vertical support as shown in Fig. 9鈥�92, the support exerts a torque on the shelf. (a) Draw a free-body diagram for the shelf, assuming three vertical forces (two exerted by the support slot鈥攅xplain why). Then calculate (b) the magnitudes of the three forces and (c) the torque exerted by the support (about the left end of the shelf).

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A rubber band is stretched by 1.0 cm when a force of 0.35 N is applied to each end. If instead a force of 0.70 N is applied to each end, estimate how far the rubber band will stretch from its unstretched length: (a) 0.25 cm. (b) 0.5 cm. (c) 1.0 cm. (d) 2.0 cm. (e) 4.0 cm.

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