# Work, energy and power(2)vector:addition of vector resolution (3)speed and acceleration (4 )rectilinear acceleration

Arun
25757 Points
5 years ago
Dear student

work is related to the amount of energy transferred to or from a system by a force. It is a scalar-valued quantity with SI units of Joule.

Work can be represented in a number of ways. For the case where a body is moving in a steady direction, the work done by a constant force  acting parallel to the displacement  is defined as

When the force is not acting parallel to the body's direction of movement, the work done is defined as a dot product of the force and the displacement,

Power-

Power is defined to be the rate at which work is performed, or the derivative of work over time. The SI unit for power is the watt.

Average power is the average amount of work done per unit of time. Thus instantaneous power is the limiting power of the average power as Δt approaches zero

Energy-

Energy is stored work. It has the same units as work, the Joule (J).

Regards