Simple Machines

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A machine is a device that helps us do work more easily by reducing the effort needed, changing the direction of force, or making the task more convenient. Example: A bottle opener helps open a tight …

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In physics, work is said to be done when a force applied on a body causes it to move. If there's no motion, no work is done. Example: Pushing a wall does no work because it doesn't move.

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Energy is the capacity of a body to do work. The SI unit of energy is joule (J). Example: A moving car has energy because it can do work by pushing something.

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Mechanical advantage (MA) is the ratio of load to effort. It shows how much a machine multiplies the force. Formula: MA = Load / Effort. Example: If MA = 3, a 10 N effort can lift a 30 N load.

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Given: Load = 200 N, Effort = 50 N Formula: MA = Load / Effort Step: MA = 200 N / 50 N = 4 Answer: Mechanical advantage is 4.

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Given: MA = 5, Load = 150 N Formula: MA = Load / Effort → Effort = Load / MA Step: Effort = 150 N / 5 = 30 N Answer: 30 N effort is required.

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A lever is a simple machine consisting of a rigid rod that turns about a fixed point called the fulcrum. It helps lift loads with less effort. Example: See-saw, crowbar.

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In a balanced lever: Load × Load Arm = Effort × Effort Arm. This means the turning effect on both sides of the fulcrum is equal.