In Physics (Class 9 - Work and Energy), Joule (J) is the standard SI unit of both Work and Energy. Defining '1 Joule' is a very common exam question.
1 Joule = 1 Newton of Force × 1 Metre of Displacement.
SI Unit: Joule (J).
Quantities sharing this unit: Work, Kinetic Energy, Potential Energy, Heat.
1 Joule = 10⁷ ergs.
1 Joule of work is said to be done when a force of 1 Newton displaces an object by 1 metre along the line of action of the force.
Mathematically: Since Work = Force × Displacement (W = F × s) 1 Joule = 1 Newton × 1 metre 1 J = 1 N·m
To imagine what 1 Joule of work feels like: If you pick up a small apple (which weighs about 100 grams or 1 Newton of gravitational force) and lift it straight up in the air by exactly 1 metre, you have just done approximately 1 Joule of work.
1 Joule of work is done when a force of 1 Newton displaces an object by 1 metre in the direction of the force.
The SI unit of work is the Joule, denoted by the letter J.
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