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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

The roof over a \({\bf{9}}{\bf{.0}}\;{\bf{m \times 10}}{\bf{.0}}\;{\bf{m}}\) room in a school has a total mass of 13,600 kg. The roof is to be supported by vertical wooden (actually about \({\bf{4}}{\bf{.0}}\;{\bf{cm \times 9}}{\bf{.0}}\;{\bf{cm}}\)) equally spaced along the 10.0-m sides. How many supports are required on each side, and how far apart must they be? Consider only compression, and assume a safety factor of 12.

(II) Calculate\({F_{\rm{A}}}\)and\({F_{\rm{B}}}\)for the uniform cantilever shown in Fig. 9鈥�9 whose mass is 1200 kg.

(II) A 110-kg horizontal beam is supported at each end. A 320-kg piano rests a quarter of the way from one end. What is the vertical force on each of the supports?

Why is it more difficult to do sit-ups when your knees are bent than when your legs are stretched out?

A 60-kg woman stands at the very end of a uniform board of length l, which is supported one-quarter of the way from one end and is balanced (Fig. 9鈥�41). What is the mass of the board? (a) 15 kg (b) 20 kg (c) 30 kg (d) 60 kg (e) 120 kg
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