Types of Work Done
Energy
1. Positive Work done: Work done is said to be positive
if force and displacement are in the same direction. . The ability or capacity of an object to do work is
2. Negative Work done: Work done is said to be called energy.
negative if force and displacement are in opposite . It is a scalar Quantity.
directions. . S.I Unit of energy - Joules
. The object which does work loses energy and the
3. Zero Work done: Work done is said to be zero if
object on which work is done gains energy.
Kinetic Energy
force and displacement are perpendicular to each
other. . The energy possessed by an object due to its motion
Work is called kinetic energy.
. K.E = ½ mv2
. Work is said to be done when force is applied on an
object and it gets displaced due to the application of
force.
. It is a scalar quantity.
Work
. Mathematically , work done is a product of force and
displacement. . Work done = Change in Kinetic Energy
. Work = Force x Displacement
. S.I Unit of Work = Joules (J) = K.Ef - K.Ei
.1J=1Nx1m = ½ mv2 - ½ mu2
Commercial Unit of Energy
. It is defined as energy consumed by an appliance of
and Potential Energy
. The energy possessed by an object due to its
Energy
1kW when it is used for one hour. position or configuration is called potential energy.
. 1 Kilowatt hour = 1 kWh = 3.6 x 10-6 J.
. 1 kWh = 1 Unit of energy.
Law of Conservation of Energy
Power . According to the law of conservation of energy,
. The rate of doing work is called Power or the work energy can neither be created nor destroyed. It can
only be converted from one form to another.
done per unit time is called power.
. The total energy before and after the transformation
. Mathematically , Power = (Work / Time)
remains the same.
. S.I unit of power is Watt (W) or (Joule / sec)
Conservation of energy for a Gravitational Potential Energy
freely falling body . The gravitational potential energy of an object at a
point above the ground is defined as the work done in
At maximum height raising it from the ground to that point against gravity.
P.E = Maximum , K.E = 0 . P.E = Work done = m x g x h
At Mid Point
P.E = K.E
At just before touching the ground
P.E = 0
K.E = max
Energy
1. Positive Work done: Work done is said to be positive
if force and displacement are in the same direction. . The ability or capacity of an object to do work is
2. Negative Work done: Work done is said to be called energy.
negative if force and displacement are in opposite . It is a scalar Quantity.
directions. . S.I Unit of energy - Joules
. The object which does work loses energy and the
3. Zero Work done: Work done is said to be zero if
object on which work is done gains energy.
Kinetic Energy
force and displacement are perpendicular to each
other. . The energy possessed by an object due to its motion
Work is called kinetic energy.
. K.E = ½ mv2
. Work is said to be done when force is applied on an
object and it gets displaced due to the application of
force.
. It is a scalar quantity.
Work
. Mathematically , work done is a product of force and
displacement. . Work done = Change in Kinetic Energy
. Work = Force x Displacement
. S.I Unit of Work = Joules (J) = K.Ef - K.Ei
.1J=1Nx1m = ½ mv2 - ½ mu2
Commercial Unit of Energy
. It is defined as energy consumed by an appliance of
and Potential Energy
. The energy possessed by an object due to its
Energy
1kW when it is used for one hour. position or configuration is called potential energy.
. 1 Kilowatt hour = 1 kWh = 3.6 x 10-6 J.
. 1 kWh = 1 Unit of energy.
Law of Conservation of Energy
Power . According to the law of conservation of energy,
. The rate of doing work is called Power or the work energy can neither be created nor destroyed. It can
only be converted from one form to another.
done per unit time is called power.
. The total energy before and after the transformation
. Mathematically , Power = (Work / Time)
remains the same.
. S.I unit of power is Watt (W) or (Joule / sec)
Conservation of energy for a Gravitational Potential Energy
freely falling body . The gravitational potential energy of an object at a
point above the ground is defined as the work done in
At maximum height raising it from the ground to that point against gravity.
P.E = Maximum , K.E = 0 . P.E = Work done = m x g x h
At Mid Point
P.E = K.E
At just before touching the ground
P.E = 0
K.E = max
