The joule is the SI unit for which quantity?

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Multiple Choice

The joule is the SI unit for which quantity?

The joule measures energy, the amount of energy stored or transferred to do work. A handy definition is that one joule is the energy transferred when a force of one newton moves an object one metre in the direction of the force. That directly links energy to work, since doing work transfers energy. Power is about how fast that energy is used, so its unit is the watt (one joule per second). Force is measured in newtons, not joules, and momentum is measured in kilogram metres per second. So the joule is the unit for energy.

The joule measures energy, the amount of energy stored or transferred to do work. A handy definition is that one joule is the energy transferred when a force of one newton moves an object one metre in the direction of the force. That directly links energy to work, since doing work transfers energy.

Power is about how fast that energy is used, so its unit is the watt (one joule per second). Force is measured in newtons, not joules, and momentum is measured in kilogram metres per second. So the joule is the unit for energy.

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