A bicycle is a compound machine made up of several mechanical components that work together to move the bicycle forward and stop it. The parts include the handlebar, brake lever, pedals, chainring, cassette, chain, and wheels. Some parts act as simple machines like levers, while others are transmission devices that transfer movement between parts like the chain, cassette, and chainring. Working together, these parts take the human energy applied through the pedals and transmit it to the wheels to propel the bicycle forward.

1. A compound machine: The bicycle

2. •A bicycle is a compound machine.
1º Handlebar
2º Brake lever
3º Top tube
4º Saddle
5º Cassette
sprocket
6º Wheel
7º Pedal
8º Chainring
9º Tyre
10º Spoke

3. • A bicycle is formed by
mechanical components.
Brake
leverHandlebar
Brake
shoe
Chainring Cassette Chain Pedals
Cables
of brakes

4. The parts of the bicycle transmit the movement
from one part to others to advance or to stop.
Advance
Stop

5. •We identify different parts in the bicycle.
Simple machines Transmission
devices.
Handlebar
Brake
lever
Pedals
Chainring Cassette
Chain

6. Simple machines
Handlebar
•It is a lever
•It changes the orientation
of the front wheel
Brake lever
•It is in the handlebar.
•The cables of the brakes are in it.
The brakes are levers
that press the brake shoe.
Pedals The pedals are levers.

7. transmission devices.
Chainring
•The chainring moves the chain.
The force of our feet move the chain.
The chain
The chain transmits the movement
using the cassette and sprocket.

8. •A bicycle uses the energy
of the human force.

9. Is a handlebar
a simple machine?
Are pedals
a simple
machine?
Is a brake lever
a simple machine?
Is the chain an
Element of
transmission?
Is the cassette an
element of
transmission?
Is the chainring an
Element of
transmission?