What you need:
A glass bottle
A ten-rupee note
What to do:
1. Place the note on a flat even surface. Smooth it down with your fingers.
2. Invert the open bottle over the note, and place it at the centre.
3. What happens when you try to slide the note out quickly from under the bottle?
4. Now, redo the entire set-up.
5. Start rolling the note from one end towards the centre.
6. Keep gently pushing the bottle towards the other end of the note as you roll.
What happens:
When you try to slide out the note from under the bottle, the bottle falls, no matter how fast you are. Rolling the note allows you to get the note out without dropping the bottle.
Why?
When you see a magician pull out the tablecloth from underneath several horribly brittle items without disturbing them, she or he is making use of Newton’s first law of motion. This law states that an object at rest stays at rest and a moving object stays in motion until an external force acts on them. So, the items on the table are at rest and like to stay that way.
The lightning fast removal of the tablecloth is to overcome the friction between the tablecloth and the items on it.
Friction is a resisting force that opposes the motion of one objects surface over another. So, if the magician tugs on the tablecloth hard and fast that force overcomes friction and the items on the table stay in their resting position thanks to their inertia
Clearly doesn’t work with the note and the bottle. The reason is that there is too much friction between the note and the bottle and the note and the tabletop Thanks to this friction, the note pulls the bottle with it every single time. That is why you have to mort to rolling the money if you can’t beat the friction just roll with it!
Picture Credit : Google
