The holes, simply let the air pass through, without any resistance. When air hits the hoarding, the hoarding board acts as a barrier in its path, so the air will try to push it If the air is too strong the board won’t be able to hold it, resulting in the airflow tearing the hoarding to make its way However when there are holes in the hoarding, then then the air hitting the hoarding will find a way to pass through holes in the hoarding, and will not damage it.

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A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage (also called leverage) to multiply force. Usually the term refers to the six classical simple machines that were defined by Renaissance scientists:

Lever
Wheel and axle
Pulley
Inclined plane
Wedge
Screw

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