When a cycle is moving at a great speed, will you be able to see the lower and upper spokes of the wheels clearly? Let's find out.

Posted by Keshav Jain on

What you need:

A bicycle and a friend to ride it.

What you do:

 • Ask your friend to cycle fast.

• Watch the upper and lower spokes of the wheels.

What you find:

The spokes of the wheels that are below are clearly visible but the upper spokes are a blur. Does it mean that the top of the rolling wheels moves faster than the bottom?

Yes. This happens because while the wheels are rotating on their axle, they are also moving forward along with the axles. At the top, the two motions are in the same direction but at the bottom the rotation is in the reverse direction.

Picture Credit : Google 

When you don’t clean the ceiling fan for some time, do the blades get uniformly dirty or do they get dirty in parts? Let’s find out.

Posted by Keshav Jain on

What you do:

  • Ask your mom not to clean the ceiling fan in your room for two to three weeks
  • Observe the blades of the fan at the end of this period.

What you find:

That most of the dirt collects on the leading edges of the blades.

 Why does this happen?

Static electricity develops on the blades of the fan when they are in motion due to friction with the air The static electricity attracts dust particles. As the edges of the blades are the first to come into contact with the surrounding air, more dust collects on them than on the other parts of the blades.

Picture Credit :Google