Machines and efficiency

Front

What is a simple machine?

Back

A simple machine is a device that changes the direction or magnitude of a force, making work easier. Examples include levers, pulleys, and inclined planes.

Front

What are the six types of simple machines?

Back

The six types of simple machines are: lever, wheel and axle, pulley, inclined plane, wedge, and screw.

Front

What is mechanical advantage?

Back

Mechanical advantage is the ratio of the output force produced by a machine to the input force applied to it. It indicates how much a machine multiplies force.

Front

What is the formula for efficiency?

Back

Efficiency = (Work Output / Work Input) x 100%.

Front

What is the work output of a machine with a work input of 2,800 Joules and an efficiency of 92.3%?

Back

2,584.4 Joules.

Front

What type of simple machine is a drill bit?

Back

A drill bit is an example of a screw.

Front

What two simple machines are used in a wheelbarrow?

Back

A wheelbarrow uses a wheel/axle and a lever.

Front

Identify the simple machine: A seesaw.

Back

A seesaw is an example of a lever.

Front

What three simple machines are used in a can opener?

Back

A can opener uses a wedge, lever, and wheel/axle.

Front

What is the purpose of a wedge?

Back

A wedge is used to separate or hold objects together by converting a force applied to its blunt end into forces perpendicular to its inclined surfaces.