# Floating sketchpen?

This post is about an experiment of mine , which was for me, remarkably interesting!

Why do I post it here?

I'm interested in knowing the physics behind this.

# MATERIALS USED

A light weight sketchpen.

# THE EXPERIMENT

I took a sketch pen, and held it by its tail. After some practice, I could manage to fling the pen up in the air while getting it to spin about the axis passing through its length.

So I had a spinning pen , going up in the air and moving through unusual paths.

I repeated the process many times to arrive at a conclusion. It seemed as if a force acted on the pen, perpendicular to its length, on the side which has a spin complementary to the direction of air flow.

So if I flung the pen up vertically, it would first accelerate towards one direction during the ascend, and then, accelerate in the opposite direction during the descend.

Now for the BEST PART:

I threw the pen, with its length parallel to the ground horizontally with spin in an anticlockwise direction w.r.t the ground. It hit the ground earlier than expected.

Next , tried the same with clockwise spin. As I expected, the pen stayed in the air for a longer than usual time.

I gradually increased the the spin to such an extent, that the pen appeared to float in the air ! It had apparently no vertical acceleration! It just moved horizontally with a constant velocity, till it hit the side walls and landed.

It seemed magical to my family and friends !

Now I wonder what made the pen fly.

Whatever it is, I know that it depends on the spin velocity, spin direction and the air flow.