You are eating and you reach for your drink on the table and… oops! You knock it over. The glass, and your drink, fall downward toward the floor. You help clean up the mess with a couple of paper towels and go to throw them in the trash. You notice, when you toss them in, they fall down to the bottom of the bin. Later on, you are playing fetch with your dog Rover and he drops the ball at your feet for you to throw it again. All these things fall down toward the ground, even the ball, when you toss up in the air for Rover to catch.
Why do things not fall up? Let’s find out.
The reason things don’t fall up is because of a force called Gravity. Gravity is an invisible force that pulls objects towards each other. This also is what keeps the earth (as well as the other planets) rotating around the sun and the moon orbiting the earth. It is also what is keeping us from floating away into space. The gravity pull that the moon has causes the low and high tides of the oceans (NASA).