# Gravity

Gravity:  A heavy topic!

Today, we talked about how strange and interesting gravity is. We know so much about gravity already, but there is so much we still need to learn. What scientists have learned about gravity has allowed us to travel into space and to the Moon. It’s allowed us to send probes out into the solar system and beyond, and even to the surface of other planets, including Venus and Mars!

We learned that gravity depends on the mass of an object, and that all objects have some amount of gravitational force. Additionally, we learned that gravity depends on the distance between objects. The further away objects are from each other, the less gravitational force they exert on each other. We demonstrated this principal by using magnets as a model. The further apart the magnets were, the less force they exerted on each other. A graph of the results showed a nice curve (parabola) giving a visual representation of the data relating strength and distance.

We examined how the mass of an object remains constant wherever you are but the weight of an object can change. Weight depends on gravity so a person weighs much less on the moon because the moon has less gravity than the earth. Alternatively, if one could stand on the sun, they would find they weigh 27 times more than on Earth!