Basics of Statics
- Fundamentals of Mechanics
Imagine the following situations:
(a) You have to design a car, which can run at a speed of 140 km/hr on an expressway. In order to do this, you have to find engine power and the forces acting on the car body. Forces will come due to wind resistance, rolling resistance and inertia.
(b)You want to find out the power needed for a CD driver motor.
(c)A nozzle issues a jet of water with a high velocity, which impinges upon the blades of turbine. The blades deflect the jet of water through an angle. You have to find out the force exerted by the jet upon the turbine.
- Equation of Equilibrium
A particle is in equilibrium if it is stationary or it moves uniformly relative to an inertial frame of reference. A body is in equilibrium if all the particles that may be considered to comprise the body are in equilibrium.
One can study the equilibrium of a part of the body by isolating the part for analysis. Such a body is called a free body. We make a free body diagram and show all the forces from the surrounding that act on the body. Such a diagram is called a free-body diagram. For example, consider a ladder resting against a smooth wall and floor. The free body diagram of ladder is shown in the right.
Three forces are acting on the ladder. Gravitational pull of the earth (weight), W of the ladder, reaction of the floor R2 and reaction of the wall R1 .
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