EVERYDAY SCIENCE

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PHYSICAL SCIENCES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The unit or label for work is
A
netwons
B
joules
C
meters
D
seconds
Explanation: 

Detailed explanation-1: -The SI unit of work is joule (J). Joule is defined as the work done by a force of one newton causing a displacement of one meter. Sometimes, newton-metre (N-m) is also used for measuring work.

Detailed explanation-2: -The SI unit for work and energy commonly used in drawing is the joule (J), which is equivalent to a force of one newton exerted through a distance of one meter (m). Work in the UK/US system is often expressed as foot-pounds (ft-lb), with one foot-pound equal to 1.3558 J.

Detailed explanation-3: -The S.I. unit of energy is joule (J) while the CGS unit of energy is erg. The kinetic energy and potential energy are just forms of energy and share the same units as energy. Therefore, the given statement that SI unit of work and energy is joule is true.

Detailed explanation-4: -Work is a measure of energy that results by applying a force on the body which displaces the body. Work done is given by the formula W = F s cos where F= force applied, s= displacement, = Angle between the force and displacement. The SI unit of work is Joule J .

Detailed explanation-5: -1 Joule (J) is the MKS unit of energy, equal to the force of one Newton acting through one meter. 1 Watt is the power from a current of 1 Ampere flowing through 1 Volt. 1 kilowatt is a thousand Watts. 1 kilowatt-hour is the energy of one kilowatt power flowing for one hour.

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