BREAKING NEWS: Aliens from the planet, Eyedoughnt Beleevu have invaded Earth! The planet that the aliens are from don't have the same laws of physics as us. They have never heard of gravity or electromagnetism and don't believe that it is real. It is our job to explain and prove that electromagnetism and gravity is real.
The cause of gravity: Gravity is caused when objects cause dents in space according to Einstein's theory. Space is the physical thing all around us also called “fabric”. When the fabric is dented by a mass we get a certain amount of gravity depending on the size and weight of the mass. Let's take Earth for example, since Earth is a large mass it causes more bending in the fabric. Hence, more bending in fabric, means more gravity.
You can manipulate gravity to make it stronger or weaker. You can do this by changing the variables that affect the strength of gravity without the objects even touching, those variables are mass and distance. If you were to take a bowling ball and a tennis ball and put them next to each other, the gravity would change, making the balls attraction stronger. Hence, more mass equals more attraction/gravity and vise versa. Also, if you were to take a tennis ball and a tennis ball and move them farther away from each other the gravity would become weaker. Hence, greater distance equals less attraction/gravity and vise versa.
Q. Which object will fall first when dropped at the same time and height, a bowling ball or a tennis ball?
A. The two objects will fall at the same time because it doesn't matter the weight of any two objects. What I mean by this is, although an object may be heavier, it has more inertia, and although an object may be lighter, it has less inertia. The ratio to force to inertia is the same for all objects. Therefore, any two objects dropped at the same time and at the same height will fall at the same time.