Physics Laboratory Experiments

Jerry D. Wilson, Cecilia A. Hernandez-Hall

Chapter 15 (GL) Simple Machines: Mechanical Advantage - all with Video Answers

Educators

Chapter Questions

01:23

Problem 1

Simple machines are sometimes divided into two basic classes, inclined planes and levers, where the wedge and screw are included in one class, and the pulley and the wheel and axle are included in another. Explain why these four simple machines can be included in the basic classes of inclined planes and levers.

Vishal Gupta

Numerade Educator

01:00

Problem 2

A machine multiplies force, but what is reduced or "sacrificed" for this force multiplication? Give a specific example.

Surjit Tewari

Numerade Educator

01:32

Problem 3

(a) State how the AMA and TMA of an inclined plane vary with the inclination of the plane.
(b) State how the efficiency of an inclined plane varies with the inclination of the plane, and explain the reason for this variation.

Nick Johnson

Numerade Educator

01:07

Problem 4

In going up stairs, the climb seems easier when going up in a zig-zag fashion, rather than straight up. Why is this?

Surjit Tewari

Numerade Educator

05:55

Problem 5

Show that the TMA of a lever can be derived from torque considerations. (See Fig. 15.2a.)

Linda Winkler

Numerade Educator

00:43

Problem 6

A single fixed pull is often called a "direction changer" rather than a force multiplier. Explain why this is an appropriate name.

Kashif Qureshi

Numerade Educator

03:08

Problem 7

The TMA of a pulley system with movable pulley(s), or a block and tackle, is equal to the number of supporting strands of the movable pulley or block.
(a) Do your experimental results support this statement?
(b) Explain the physical basis of this statement.

Jayashree Behera

Numerade Educator

01:27

Problem 8

Give three common applications of the wheel and axle. (Hint: Is a screwdriver a wheel and axle?)

K Joseph

Numerade Educator

01:03

Problem 9

Estimating the radii of a common doorknob and its shaft, how much force is applied to the shaft mechanism when the knob is turned with an applied force of $2.0 \mathrm{~N}$ ?

Narendra Kumar

Numerade Educator