Choose 5 objects from our class that you could measure the weight of.
Put them in order of what you predict will be lightest to heaviest.
Take a photo of your predicted order
Measure the actual weight of the objects
Put them in the correct order of their actual weight - lightest to heaviest
Take another photo
Get a buddy to video you talking about the difference between the order you predicted and the actual order. Make sure you talk about the device & units you used for measuring the weight.