/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 3 The best way to lift a heavy wei... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 12: Problem 3

The best way to lift a heavy weight is to squat with your back vertical, rather than to lean over. Why?

Short Answer

Expert verified
Squatting with a vertical back is the preferred method of lifting heavy weights because it reduces strain on the lower back by creating lesser leverage as the weight is closer to the pivot point, and the force is exerted directly upward. This makes the task mechanically easier and safer.

Step by step solution

01

Understanding the Problem

The exercise talks about two methods of lifting a weight. The key to the solution is understanding why a vertical back is preferred over leaning forward when lifting a heavy object. This is a physics problem related to leverage and mechanical advantage, which are principles that determine how muscles in the body react to different positions.
02

Leaning Over

When one leans forward to lift an objective, the forces that maintain balance are concentrated on the lower back. This means that the lower back is the pivot point. The distance from the pivot point (lower back) to the weight and to the muscle exerting the force (back and leg muscles) create a leverage system that, when unbalanced, will put a large amount of strain on the back leading to possible injury due to the overcompensation of the back muscles.
03

Squatting with a vertical back

Contrarily, in squatting position with a vertical back, the weight is held close to the body which decreases the distance from the weight to the pivot point (lower back). Also, the force is exerted directly upward by the leg muscles. As such, this method allows the person to lift the weight directly upwards in a more manageable and safer way. Decreasing the distance from the pivot point to the weight makes the task mechanically easier and safer by reducing the strain on the back muscles.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

How does a heavy keel help keep a boat from tipping over?

A rectangular block measures \(w \times w \times L,\) where \(L\) is the longer dimension. It's on a horizontal surface, resting on its long side. Use geometrical arguments to find an expression for the angle through you would have to tilt it in order to put it in an unstable equilibrium, resting on a short edge.

A stiltwalker is standing motionless on one stilt. What can you say about the location of the stiltwalker's center of mass?

A body is subject to three forces: \(\vec{F}_{1}=1 \hat{\imath}+2 \hat{\jmath} \mathrm{N},\) applied at the point \(x=2 \mathrm{m}, y=0 \mathrm{m} ; \vec{F}_{2}=-2 \hat{\imath}-5 \hat{\jmath} \mathrm{N},\) applied at \(x=-1 \mathrm{m}, y=1 \mathrm{m} ;\) and \(\vec{F}_{3}=1 \hat{\imath}+3 \hat{\jmath} \mathrm{N},\) applied at \(x=-2 \mathrm{m}, y=5 \mathrm{m} .\) Show that (a) the net force and (b) the net torque about the origin are both zero.

When you carry a bucket of water with one hand, you instinctively extend your opposite arm. Why?
See all solutions

Recommended explanations on Physics Textbooks

Fluids

Read Explanation

Wave Optics

Read Explanation

Waves Physics

Read Explanation

Mechanics and Materials

Read Explanation

Kinematics Physics

Read Explanation

Particle Model of Matter

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.