Science 8 Unit 5 Vocab Check

Front

What is a simple machine?

Back

A simple machine is a device that does work with only one movement, making tasks easier by changing the direction or magnitude of a force.

Front

What is power in the context of work?

Back

Power is the rate at which work is done or energy is transferred, typically measured in watts.

Front

What is a pulley?

Back

A pulley is a simple machine that consists of a grooved wheel with a rope or cable wrapped over it, used to lift or lower loads.

Front

What does efficiency mean in physics?

Back

Efficiency is the ratio of useful output work to the total input work, often expressed as a percentage.

Front

What is a wheel and axle?

Back

A wheel and axle is a simple machine that consists of two circular objects of different sizes that are attached in such a way that they rotate together.

Front

What is the formula for calculating efficiency?

Back

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

Front

What is the relationship between work and energy?

Back

Work is the transfer of energy that occurs when a force is applied over a distance.

Front

What is the unit of power?

Back

The unit of power is the watt (W), which is equal to one joule per second.

Front

What is the difference between input work and output work?

Back

Input work is the total work done on a machine, while output work is the useful work done by the machine.

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.