# What is called thrust? What is called pressure? What is called mass? What is called weight?

Harshit Singh
2 years ago
Dear Student

THRUST:
Thrustis areactionforcedescribed quantitatively byNewton's third law. When a system expels oracceleratesmassin one direction, the accelerated mass will cause a force of equalmagnitudebut opposite direction on that system. The force applied on a surface in a direction perpendicular ornormalto the surface is also called thrust. Force, and thus thrust, is measured using theInternational System of Units(SI) innewtons(symbol: N), and represents the amount needed to accelerate 1 kilogram of mass at the rate of 1meter per second per second.

PRESSURE:
Pressure is theforceapplied perpendicular to the surface of an object per unitareaover which that force is distributed.TheSIunit of pressure, thepascal(Pa), for example, is onenewtonpersquare metre(N/m^2).

MASS:
Massis both apropertyof aphysical bodyand ameasureof itsresistancetoacceleration(a change in its state ofmotion) when anet forceis applied. An object's mass also determines thestrengthof itsgravitationalattraction to other bodies.
The basicSI unitof mass is thekilogram(kg). Inphysics, mass is not the same asweight.

WEIGHT:
Theweightof an object is theforceacting on the object due togravity.Theunit of measurementfor weight is that offorce, which in theInternational System of Units(SI) is thenewton.

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