Thames & Kosmos Gravity Bugs - Free-Climbing MicroBot handleiding

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Thames & Kosmos

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Handleiding

Suction cup

Air particles

Surface

Unstuck suction cup:

Pressing suction cup down:

Stuck suction cup:

Low pressure

CHECK IT OUT

By pressing its suction-cup feet onto the window, the Gravity Bug creates a negative pressure there.

This means that the air pressure existing there is lowerthan the environmental air pressure all around

it. This negative pressure ensures the Gravity Bug stays stuck to the smooth surface, as the pressure of

the atmosphere outside of the suction cups is pushing them toward the surface, while there is virtually

no pressure pushing them away.

It is important that the contact between thesuction cup and the climbing surface is free of

gaps and as airtight as possible. Gaps causedby dust or dirt cause leaks that allow

additional air to enter, destroying the negative pressure. Moistening the suction cups can

improve the grip. The thin film of water fills in the small gaps andmakes for a better seal.

You can create a negative pressure by gently sucking air from an empty water bottle with

your mouth. You feel the negative pressure as soon as your lips are pressed against the bottle

opening. The force thatyou can feel is the reason why the Gravity Bug sticks to vertical surfaces. Again,

it is important to ensure that the contact between the bottle and your lips is airtight.

Suction cups use air pressure to stick to hard, smooth surfaces where a

partial vacuum can be created. A suction cup has a cup-shaped surface

made of a flexible material, like silicone, rubber, or plastic. When this cup

is pressed against a hard surface, the air inside the cup, between the cup

and the surface, gets pushed out. The regular atmospheric air outside the

cup, which contains many more air particles per unit volume of space

than inside the cup, remains the same. These air particles are constantly

flying around through the air and hitting things, making a tiny impact,

the sum of which is air pressure.

Because there are a lot more air particles

per unit volume on the outside of the

cup than there are on the inside, the air

pressure is higher on the outside. This

difference in air pressure is what keeps

the suction cup stuck to the surface.

Gravity Bugs

HOW DO

Suction Cups

WORK?

How

does the

Gravity bug

Climb

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