We encounter various types of lever in our everyday lives: opening a drink with a bottle opener, cutting paper with scissors, taking the lid off a paint pot using a screwdriver, and – the simplest of all – playing on a seesaw in the park. Yet, the principle of levers is sometimes so natural to us that we do not pay any attention to how it actually works.

ere are four basic elements to consider when using a lever:

•     Pivot – the point around which something turns
•     Beam – a wooden plank or solid rod that rests on the pivot
•     Load – the item or object being moved or lifted on the beam
•     Force – the effort or input needed to move the beam and the load

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