If you're struggling to explain how gravity works, or what gravity is to your little one, there are some great printables that can help you further your explaination and give them some fun activities to help them remember. When I was younger, I remember doing activity sheets and experiments at home and at school, and it was a lot of fun. It really was learning and having fun at the same time.

Pull of Gravity Science Activity Worksheet - www.greatschools.org/worksheets-activities/6315-what-would-you-weigh-on-the-moon.gs

Parachute Gravity Experiment Worksheet - www.greatschools.org/worksheets-activities/6297-why-parachutes-work.gs

Gravity Activity Printable Worksheet - www.teachthisworksheet.com/static_worksheets/index/407

Here are more fun worksheets for kids:
Habitat Worksheets - www.bubblews.com/news/1289171-habitat-worksheets-for-kids