Machines Part 2

• 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 .