Chapter 3, lesson 2: Using machines

Defining “machine” Machines make work easier Machines alter how work is done, not the amount of work done

Input versus output Whatever effort you (or something else) applies to a machine is the work input. When the machine applies that work to the desired outcome, that is called the work output.

How does a machine make work easier? Machines might change – 1) the amount of force needed, 2) the distance over which the work is done, or 3) The direction of the force

Quick check How does a single pulley make work easier? How does a crowbar make work easier? How does an inclined plane make work easier?

Mechanical Advantage Mechanical advantage can be found if you divide the output force by the input force Read pages 94 - 98. Complete the Math skills question on page 98 and question number 9 on page100.