i) Define force and SI unit of force and its
relation with C.G.S. unit:
i) what is meant by moment of force. How its.
magnitude is found out.
1. Define SI unit of pressure.
Answers
Explanation:
(i) The force is the product of mass and acceleration. its SI unit is Newton andCGS unit is dyne. The relation betweenSI and CGS unit of force is. The CGS unit of force is equal to SI unit of force. Hence, The relation between SI and CGS unit of force is the CGS unit of force is equal to SI unit of force
CGS unit of Force = dyne
The dyne is a unit of force specified in the centimetre-gram-second (CGS) system of units, a predecessor of the modern SI. One dyne is equal to 10−5 N.
(ii) Turning effect of force acting on a body about an axis is called moment of force. It is equal to the product of magnitude of force and the perpendicular distance of the line of action of force from the axis of rotation
(iii) .The SI unit for pressure is the pascal (Pa), equal to one newton per squaremetre (N/m2, or kg·m−1·s−2)
Answer:
Unit force: If m = l,a = 1 then F=1 Unit force is that force which produces unit acceleration in unit mass In SI, force is measured in newton (N).
Force is said to be I N, if it produces an acceleration of I ms-² in a body of mass 1 kg.
The C.G.S. unit of force is dyne. If m = 1 g;a = | cms-² : F= l dyne.
Hence, force applied is said to be 1 dyne if it produces an acceleration of 1 cms-² in a mass of 1g, 1 N = 10^5 dyne.