# Physical quantity of ________ is measured in watt?

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Physical quantity of ________ is measured in watt?
1. Power
2. Momentum
3. Impulse
4. Kinetic Energy

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Correct Answer - Option 1 : Power

CONCEPT:

• Physical quantity: It is a property of a material or system that can be quantified by measurement. A physical quantity can be expressed as the combination of a numerical value and a unit.
• For example, the Physical quantity mass can be quantified as n kg, where n is the numerical value and kg is the unit.
• Power: It can be defined as the rate at which work is done i.e. energy converted.

The formula for power is P = W / t

• The unit of power is the watt (W)

EXPLANATIONS:

• Power is the physical quantity that is measured in watts.
• Hence option 1 is the answer.

• Momentum: Momentum is a physics term, it refers to the quantity of motion that an object has. A sports team that is on the move has momentum. If an object is in motion (on the move) then it has momentum.
• momentum is mass times velocity. ( mv)
• Impulse: A car is traveling at full speed. it crashes into the barrier, because of the negligence of the driver.
• Impulse is the big force acting for a very small interval of time, it is represented by J.
• Impulse formula is articulated as

J = F × t

• where the force applied is given as F and the time interval throughout which force is applied is given as t.
• Kinetic energy: "Kinetic energy is the energy possessed by the body by virtue of its motion"
• Kinetic energy is a scalar quantity.
• Kinetic energy is completely described by a magnitude alone.
• The SI unit of kinetic energy is Joule which is equal to 1 kg.m2.s-2.
• The C.G.S unit of kinetic energy is erg.

K.E = 1/2mv2.