How to make a small scale

(1) Choose disposable chopsticks and polish them with a knife and sandpaper;

(2) Cut the iron sheet into a circle to make a weighing pan, tie it on the disk surface with a string, and lift it;

(3) drilling a hole at one end of the polished balance beam and hanging a disc;

(4) Tie a rope with a nut of about 5g to make it heavier;

(5) Hang the balance beam, disc and nut, find out the center of gravity of the whole system, drill a small hole on the center of gravity, and hang a rope as a lifting buckle;

(6) Don't put objects to balance the steelyard, find out the position of the zero scale line and mark it;

(7) Put a 20g object and find out the position of the weight when the 20g object is balanced, which is the position of the 20g object here;

(8) Draw an average of 20 scales between the zero scale line and the 20g position, and each scale is1g..