Physics is life. Everything we do in life concerns physics. It can explain anything on earth that we can think of. I, personally, love skateboarding even if i cannot skateboard, so I decided to discover how physics can explain skateboarding. Skaters have fun while performing cool skateboard tricks, but some don't actually know that the laws of physics help them do what they do. When performing an Ollie, three majors forces act on the skateboard just before the skater jumps in the air. These forces are: The weight of the skater which is indicated by the blue arrow on the picture above pointing down, then we have the force of gravity on the skateboard indicated by the black arrow and we finally have the force of the ground pushing up on the skateboard indicated by the blue arrow pointing up. These three forces balance out to zero, which is why the skateboard rolls along at a constant speed. Vh on the picture is just showing the velocity at which the skateboarder rides along.