Momentum (p) is a measure of how hard it is to stop a moving body. It is the product of the mass of an object and its velocity. Since velocity is a vector quantity, momentum has the same direction as the velocity.
Impulse (J) is the product of the force acting on an object and its displacement. Since force is a vector quantity, impulse has the same direction as the force.
J = Ft
An impulse changes the momentum of an object. Therefore,
J = Dp
The law of conservation of momentum is one of the most important laws in all of
physics :
In a system consisting of bodies on which no outside forces are acting,
the total momentum of the system remains the same.
Any momentum that is lost by one body in the system is gained by one or more of the
other bodies in the system.
Work : When a force moves a body on which it acts in the direction of the force,
we say it has done work. The work done by a force is found by multiplying the force
by the distance it has pushed the body in the direction of the force.
W = Fd
The unit of work is the newton-meter, which is also called the Joule (J).
Power : The rate at which work is done is called power. It is found by
dividing the work done by the time it takes to do it.
P = W/t
The unit of power is the J/s, which is also called the Watt (W).
Energy : The ability to do work is called energy. Like work, it is measured in Joules (J).
Potential Energy (PE) is associated with the position or state of a body.There are many types of potential energy.
Gravitational Potential Energy (PEg) is the stored energy due to an
object's height.
PEg = mgDh
Elastic Potential Energy (PEs) is the energy stored in a spring or
elastic material.
PEs = 1/2 kx2
Kinetic Energy (KE) is energy that a body has because of its motion.All
objects in motion possess kinetic energy.
KE = 1/2 mv2
The law of conservation of energy is another important law of physics :
Energy can be changed from one form to another but cannot be created or destroyed.
The total amount of energy in a closed system remains constant.
Click Here For A Great Website All About Momentum