The concept of a periscope:
Both periscope and telescope apply the same concept of light reflection. Light is being reflected by two mirrors before entering the eyes of the user.
I can view the image from the upper level!
你的電郵地址並不會被公開。 必要欄位標記為 *
The formation of whirlwind
When the local temperature is high, air near the ground expands and rises (low air density) to a higher level where the temperature is low (high…
The concept of a catapult:
A catapult applies the concept of lever mechanic. It uses the elasticity of a belt and wood to balance the downward force. The lever arm…
The concept of electric motor
The basic mechanism of an electric motor and an electric generator is almost the same except its concept. An electric generator is an electrical…
The concept of lever is also called “Leverage equilibrium condition”. In order to balance the lever at a fulcrum, the input force (effort) and the output force (load) exerted…
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