Now that you are experts on heavy and light objects. Find objects around your home that are heavy and ones that are light. Put into 2 groups and take a picture of them to send to Ms Matthews.
What do notice about the heavy objects? What do you notice about the lighter objects?
Are big objects always heavy and little objects lighter?
Try and find an object that is big but is light and try and find an object that is small but heavy. Send a picture of what you found.