A rubber band will , approximately, stretch an amount "x" in direct proportion to the force "F" applied to it. So you can write this as an equation, F = KX . To find the proportionality constant "K" , hang a known weight "W" from the rubber band and measure the stretch "L". then divide W/L = K . This is called "calibrating" the rubber band.
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you want a soft rubber band ball with strechy rubber bands,but you also want to be carefull that you dont make it to big and to small
an equation
Measure how much it can lift.
Stretching the rubber band would lengthen it. It is the sentence containing the lengthen word.
You cannot. A pound is a measure of mass while a newton is a measure of force, The two measure different things and conversion from one to another is not generally valid.