If something pulls against gravity, you can sometimes make things move in other directions. This lever helps you pull more strongly than gravity and lift a 500 lb. weight. Before starting the ball, try to predict where it will go. Start the ball and describe three places that gravity makes the ball move down. Describe three ways the ball is made to go up against the pull of gravity.
Gravity holds water and air near the surface of the earth and affects how they move around.
Find where water is added to the stream table and where it leaves. The stream table shows how gravity makes rivers flow from higher areas to lower ones. Besides a river, give three other examples in nature where gravity pulls water down. Watch several of the balls as they follow different pathways. Gravity pulls down on airplanes and birds.