- Some tools of devices use more than one simple machine, such as scissors.
- A tool or device that has more than one simple machine is a complex machine.
- Example :
|Step Ladder - Inclined plane, Screw|
|Mechanical pencil sharpener - Wedge, wheel and axle|
|Puncher - Lever, wedge, screw|
|Scissors - Wedge, lever, screw|
- By using the simple machine or complex machine, can help us to do a lot of work and easy.
- Such as :
|They use a pair of scissors to cut the paper to make the card .|