Applied Mechanics (General Engineering) (SSC JE)

Simo chart–A simo chart is a chart, often based on firm analysis, used to record simultaneously on a common time scale the therbligs or groups of therbligs performed by different parts of the body of one or more works.
• Simo chart is simultaneous motion chart.
• Simo charts are used primarily for operation of short duration often performed with extreme quickness.

Lami's Theorem
• When three forces, acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two forces.

If the horizontal range of a projectile is maximum less. Then the angle of the projectile must be 45º with horizontal.

Projectile–Any object that is given an initial velocity obliquity and follow a path determine by the gravitational force acting on it is called projectile.
Projectile motion–The motion of projectile is known as projectile motion.

• The potential energy of a simple pendulum is maximum when it is at the turning point of oscillation.
• When the pendulum is constant then the height of its bob is minimum from ground level. Hence, potential energy is minimum.

We know that, when two forces P, Q acts any angle 'θ' then, its resultant

Varignon's theorem (Moment of forces)
• Moment of resultant of forces about a point (in the same plane) is equal to the summation of moments of the components of forces about the same point.
• This theorem, also called the principal of moments, and useful in scalar moment calculation. In cases where the perpendicular distance is hard to determine, varignon's theorem offer and alternative to find that distance.

Varignon's theorem states that the algebraic sum of moments of two unequal forces about any point in their plane is equal to the moment of their resultant about that point.

In dry friction, the frictional force acts tangent to the contacting surfaces in a direction opposed to the motion or tendency for motion of one surface relative to another.
• Dry friction is the resistive force that encounter between the two solid surfaces.