PROPERTIES OF FLUIDS
Mechanics : Deals with action of forces on bodies at rest or in motion.
State of rest and Motion: They are relative and depend on the frame of reference. If the position
with reference to frame of reference is fixed with time, then the body is said to be in a state of rest.
Otherwise, it is said to be in a state of motion.
Scalar and heater quantities: Quantities which require only magnitude to represent them are
called scalar quantities. Quantities whijch acquire magnitudes and direction to represent them are
called vector quantities.
Eg: Mass, time internal, Distance traveled _ Scalars
Weight, Displacement, Velocity _ Vectors
Velocity and Speed: Rate of displacement is called velocity and Rate and distance travelled is
Acceleration: Rate of change of velocity is called acceleration. Negative acceleration is called
Momentum: The capacity of a body to impart motion to other bodies is called momentum.
The momentum of a moving body is measured by the product of mass and velocity the moving
Momentum = Mass x Velocity
Newton’s first law of motion: Every body continues to be in its state of rest or uniform motion
unless compelled by an external agency.
Inertia: It is the inherent property the body to retain its state of rest or uniform motion.
Force: It is an external agency which overcomes or tends to overcome the inertia of a body.
Newton’s second law of motion: The rate of change of momentum of a body is directly
proportional to the magnitudes of the applied force and takes place in the direction of the applied