Work is defined as the change of kinetic energy of an object caused by a force along a distance.
Work is commonly denoted by the latter
The SI unit for work is joule [J] which is the same as
in SI base units.
When focusing on an object moving along a straight line under the effect of constant forces
.
Let's define a
axis along the line of motion.
According to Newton:
=
The acceleration
is constant (the sum of forces is constant, and so the following kinematic formula is relevant:
(
-The final velocity,
-The initial velocity)
When inserting the previous equation into Newton's second law:
And after a few algebric actions we get:
From that we can conclude that
Work like energy is a scalar but is defined as the product of two vectorial parameters:
and so in a two dimentional space work is defined as the scalar product
of force
and change in place
.
As of this snapshot date, this entry was owned by bloftin.