Skateboarders rely on Newton's first law of motion for every trick.
This law states that a skateboarder will remain at rest unless acted upon by an outside force .
Gravity will supply the external force to skateboard .
To get started, as you drop into the ramp gravity pulls on your board and you start to speed down the ramp.
The faster you go ,the more air you will be able to get when launching off the opposite side of the ramp.
Air
Another factor that influences how high you will go is the height of the ramp.
The taller the ramp, the more gravitational potential energy you will store when you are at the top of it.
When you push the nose of your board down the ramp, the stored energy now gets converted into kinetic energy .
As you roll up the opposite side of the ramp , the energy of motion will send you into the air.
Once you are in the air it gets converted back into potential energy. The higher you go, the more potential energy you will have.
Pumping
When riding in halfpipes skateboarders have a need for speed. The faster you go, the higher the air you can achieve.
Achieving greater heights gives you more time to land that move.
On a ramp , a skater will use a method called pumping.
Pumping in a half-pipe requires a skater to drop down into a crouch while traversing the flat bottom of the U-shaped pipe.
Then, as he/she enters the transition , he/she straightens his/her legs and rises up.
By raising the skaters center of mass just at the beginning of the ramp’s transition,
the skater gains energy and thereby increases speed.
The extra speed that comes from pumping is a result of the equivalence of work and energy.
As you move into the bottom the transition,
Centripetal force makes it harder than normal for you raise yourself. The net work you do in lifting yourself is equal to a net energy gain.
This energy gain translates into more speed and greater height at the lip of the ramp.
Sticking to your board
To keep your skateboard near your feet, Skateboarders rely on Newton's third law of motion.
This law states that if one object exerts a force on a second object, then the second object exerts a force of equal strength in the opposite direction on the first object.
Therefore when you reach the edge of the far side of a ramp ,you stomp down on the board's tail.
This causes the ramp to push up on your board with an equal force.
This reaction force pushes the board off the ramp and into the air.
When in flight the friction between your shoe soles and the upward-pushing skateboard helps keep the board close to your feet .
Newton's three laws of motion describe the relationship between a force and the motion of an object.
Sir Isaac Newton published the laws in 1687, but physicists still use them to predict how objects move.
As a skateboarder rides down a half-pipe, Newton's first law predicts that he will keep moving unless acted on by an outside force, like friction.