I was looking for a quick, easy way to add weight to a Pinewood Derby car. You can use lead or tungsten, but they are relatively expensive ($1 - 2 per ounce), come in odd shapes, and you have to figure out a way to attach them to the car. Pennies, which are 97% zinc cost about $0.10 per ounce (or free if you find them under the sofa). An ounce of penny is the same weight as an ounce of lead, so why not go cheap. What you loose in increased volume needed for the same mass, you make up for with the utility of a uniform size and weight object. 

Disclaimer: This is my daughter's car, so no comments about pink or the hearts, please!
Also, no pennies were harmed in the process of this Instructable!

Step 1: Supplies

Things you need:
 - accurate scale.
 - 3/4" drill bit and drill.
 - some loose pennies.
 - masking tape (optional).
 - hot glue or epoxy (optional).
<p>Our car was so light and thin I needed to use larger coins and two holes. A 1&quot; spade bit worked for quarters (actually Chuck E Cheese tokens).</p><p>Also if the coins are not snug, instead of glue you can wrap in masking tape as many times as necessary (twice in my case).</p>
<p>Nice idea! The weights would be more effective at the back of the car. This increases the height from which the weight falls and in turn increases the amount of potential energy of the car. </p>
<p>Thank you so much for this!! This was our first year in scouts and we waited until the last possible moment to add weight. It was such a great idea! So simple! So easy! Thanks for bailing us out!!</p>
<p>yes, superglue and small change is way cheaper than purchased weight.</p>
we always used quarters
Other coins that equal an ounce:<br><br>5 quarters<br>5 nickels + 1 dime<br>12 dimes<br><br>For weighing our cars, we take them to the Post Office and use the self-serve stamp machine, since we don't own our own postal scale.<br><br>It's always good to have some pocket change on hand on race day (along with crazy glue or tape) for that last-minute adjustment in case the race scale doesn't agree with yours.<br><br>Great idea to post here, and happy racing!
<em>&quot;I love you Dad and Mom&quot; on the bottom. That makes it go faster</em>.<br> I like that, and coinage is good for <a href="https://www.instructables.com/id/Lego-pan-balance/" rel="nofollow">weights</a>.<br> <br> L

About This Instructable




More by MakersBox:Easy Joule Thief Soldering Project Using an Arduino Drawing Robot with Hour of Code Tutorials Arduino Drawing Robot 
Add instructable to: