Question

Some working models for class 9 superb and beautiful models

Answer 1

hey mate please check out YouTube

"THE WRENCH" YouTube channel he makes some of the best diy projects

underbuget

Answer 2

Answer:

Hydraulics

Explanation:

You can construct a Hydraulic Robotic Arm that take the appearance of a  crawler such as the bulldozer truck or machine. It's main concept is that it uses syringes and has liquid present inside of different colors to determine different syringes and by applying pressure and force. You'll be able to make the Robotic Arm move ( https://www.youtube.com/watch?v=P2r9U4wkjcc ).