Chapter 5 Flashcard - Work, Power and Machines

Front

What is a pulley?

Back

A pulley is a simple machine that consists of a rope that fits into a groove in a wheel.

Front

What is the unit used to measure power?

Back

The unit used to measure power is the Watt.

Front

In which situation is work not done?

Back

Work is not done when holding a 20-pound box above the floor.

Front

What is a machine?

Back

A device that makes work easier is called a machine.

Front

What is the formula for work?

Back

The formula for work is Work = force x distance.

Front

What is the definition of work in physics?

Back

Work is defined as the transfer of energy that occurs when an object is moved over a distance by an external force.

Front

What is the relationship between work and energy?

Back

Work is a measure of energy transfer; when work is done on an object, energy is transferred to that object.

Front

What is mechanical advantage?

Back

Mechanical advantage is the ratio of the output force exerted by a machine to the input force applied to it.

Front

What is the difference between power and work?

Back

Power is the rate at which work is done, while work is the total energy transferred.

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.