Science Experiments with Gravity

Do you have any activities for teaching my children about gravity? - Falling Apple
Answer: The following experiments deal with the force of gravity. Gravity causes all objects to be pulled toward each other. Because Earth is the biggest object around, it has the strongest pull of gravity. It is gravity that holds us on Earth and causes balls thrown in the air to fall to the ground.
Experiment No. 1: How does gravity work? Place a marble in a bottle. Turn the bottle over. What happens? Again, place a marble in a bottle. Move the bottle so the marble starts going around inside it. Keep moving the bottle and gradually turn the bottle on its side and then upside down. Did the marble fall out of the bottle? It shouldn't have. Centrifugal force should have pulled the marble away from the bottle neck and overcome the gravity that would cause it to fall out.
Experiment No. 2: Can you feel gravity? Jump up from the ground to the first step of a set of stairs. Then jump down. Which was easier to do? If you didn't feel a difference, try jumping down with your eyes closed, but be careful. Gravity is pulling you down toward Earth -- making it easier to jump down.
Experiment No. 3: Will shape affect how fast an object falls? Climb up on a chair, extend your arms and drop equal-size sheets of paper to the floor. Did they arrive at about the same time? Now drop a sheet of paper and a crumpled-up sheet of paper. Did they arrive at the same time? Repeat this experiment with other objects.