Work
When a force acts on an object and the object
actually moves in the direction of force, then the work is said to be done by
the force.
Work
done by the force is equal to the product of the force and the displacement of
the object in the direction of force.
If
under a constant force F the object displaced through a distance s, then work
done by the force
W
= F * s = F s cos θ where a is the smaller angle between F and s.
1.
Elastic collision
The
collision in which both the momentum and the kinetic energy of the system
remains constant..
Coefficient
of Restitution or Resilience
The
ratio of relative velocity of separation after collision to the velocity of
approach before collision is called coefficient of restitution resilience.
It
is represented by e and it depends upon the material of the colliding bodies.
For
a perfectly elastic collision, e = 1
For
a perfectly inelastic collision, e = 0
For
all other collisions, 0 < e < 1
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