Question

How we can make a spring balance

Answer 1

Take a 3 inch long spring and a 6 inch plastic scale. Make a hole on number one side on the top and middle on the scale. Bend the spring ends so they make a vertical loop. Now take a key ring. holder. Put the spring and scale the way you put the keys. Now your spring balance is ready. Put a S type hook to the spring the other end. Tie a toothpick in the middle of the spring. Now note the reading of the toothpick. Attach a known weight and read the toothpick reading. Attach another known weight and read the toothpick position on the scale. You must hang the key holder. Now you know the weight and the number of divisions the toothpick has moved. You have the scale. You weigh unknown weight and take the reading. Calculate its weight and compare its weight with the other balance.