BigBook-Book 1 Unit 18 (E)

14 카드 | CompassPublishing

세트공유

bicycle

a type of transportation with two wheels
Do you own a bicycle?

chain

a series of objects connected together
A pulley is a wheel that moves by pulling a chain.

compound

made up of two or more parts
But did you know your bicycle is a compound machine?

easy

not difficult
Simple machines are tools used to make work easier.

a word that shows a choice
A compound machine is made up of two or more simple machines.

pedal

a lever operated using the foot
The pedals of your bicycle are part of a pulley system.

play

an activity for pleasure
Bicycles are used for work and play.

pulley

a small wheel with a grooved rim used with a chain
A third simple machine is a pulley.

simple

easy to understand
A compound machine is made up of two or more simple machines.

system

a combination of parts that make a whole
The pedals of your bicycle are part of a pulley system.

third

being next after the second in order
A third simple machine is a pulley.

turn

to rotate around a center
An axle holds the wheel and allows the wheel to turn.

wheel

a circle that rotates
Another simple machine is a wheel and axle.

work

labor
Bicycles are used for work and play.