Mechanical Whiteboard Cleaner

問答精華

Why do you need a fair test? Because different force adding on the board will affect the cleaning result.

How about the real size machine? Have you tried it? No, because the machine is too big and we didn't have material to make it. So we tried the small one.

How about the movable whiteboard, can it fit the movable whiteboard? Have you tried to do it? No, we haven't tried.

Any important thing or item you've learned in this experiment? Co-operate with classmate, write an experiment report, drawing and never give up.

What have you learned in this science fair? Experiment skill, Pulley system.