Work and Machines

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

How do you calculate mechanical advantage?

Back

Mechanical advantage (MA) = Output Force / Input Force.

Front

What is a simple machine?

Back

A simple machine is a device that does work with only one movement, such as a lever, pulley, or inclined plane.

Front

What is the formula for efficiency?

Back

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

Front

What does it mean when work is done?

Back

Work is done when a force causes an object to move in the direction of the force.

Front

What happens to work when the force is perpendicular to the motion?

Back

When the force is perpendicular to the motion, the work done is 0.

Front

What is the efficiency of a machine that does 20 J of work but only outputs 11 J?

Back

Efficiency = (11 J / 20 J) x 100 = 55%.

Front

What are the two conditions for work to be done?

Back

1. An object must move. 2. The object must move in the direction of the force applied.

Front

What is an inclined plane?

Back

An inclined plane is a flat surface tilted at an angle to help lift objects with less effort.

Front

What is a lever?

Back

A lever is a simple machine that consists of a rigid bar that pivots around a fixed point called the fulcrum.