always
Does gravity affect a person's height and why?
The higher the center of gravity the easier it is to roll over.
the pull of the moon's gravity on the ocean.
Mass, gravity, height.
The mass, height and the force of gravity at the location.
It prevents him from just gaining height, and he can walk and run and move incars.
Gravity, air resistance, the material of the ball, and the height from which it was dropped initially.
I don't know. Figure it out on your own.
The higher the height the bigger the radius will be, due to gravity
The farther it is from Earth, the less gravity will there be. Gravity will never completely disappear.
Skateboarders do not defy gravity. They use typically an ollie to do aerial tricks. An ollie is a move in which the skateboarder "pops" the tail (to push the board in the air) and slides their front foot forward (to balance the board). This is probably the most useful trick in skateboarding. From an ollie you can grind or grab or flick the board.
Height directly affects gravitational potential energy, since this energy is equal to mgh (mass x gravity x height). Height does not affect kinetic energy, which depends on the speed, not on the height. Except indirectly - for example, if an object is falling down, its speed will usually increase.