Summary
Highlights
Introduction to Simple Machines00:00:31
Some heavy loads are difficult or impossible to move without help. Simple machines are mechanical devices with few parts that reduce the force needed to accomplish a task. There are three types: the inclined plane, the lever, and the wheel. This video focuses on the inclined plane.
Derivatives of the Inclined Plane: The Wedge00:01:56
Two simple machines are derived from the inclined plane: the wedge and the screw. A wedge consists of two inclined planes placed against each other. It reduces the force required to separate objects, like a knife or an axe, or to separate two joined objects, like a flat-head screwdriver. It can also be used to level objects, like a wooden shim.
Derivatives of the Inclined Plane: The Screw00:02:36
A screw is an inclined plane wrapped around an axis, forming a helix called a thread. Screws increase pressure between two objects or fasten them together. They can exert pressure, like a bolt and nut, or fix objects together using various types of conventional screws. They can also move liquid or solid substances, like a snow blower.
Understanding the Inclined Plane00:00:53
An inclined plane is a rigid, flat surface at an angle to the horizontal. It allows lifting or lowering loads by sliding them instead of lifting them directly. For example, moving a 5 Newton mass vertically requires 5 Newtons of force, but sliding it up an inclined plane might only require 3.5 Newtons.
Efficiency of an Inclined Plane00:01:32
For an inclined plane to be efficient, friction between the load and the plane must be minimized. Also, a lower slope requires less force but increases the distance covered. Examples in daily life include wheelchair ramps, moving ramps, and stairs.