Question

3. Differentiate between the following:
(i) Density and Relative Density
(ii) Mass and Weight
(iii) Rotatory and circular Motion
(iv) Distance and Displacement
(v) Speed and Velocity​

Answer 1

Answer:

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• Density and relative density :- The density of a material is its mass per unit volume. Relative density of a substance is the ratio of density of a substance to the density of water. SI unit of density is kg/m3. Relative density is a dimensionless quantity.

• Mass and weight :- In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.

• Rotatory and circular motion :- In rotatory motion, the axis of rotation passes from a point in the body itself where in a circular motion, the axis of revolution passes through a point outside the body.

• Distance and displacement :- Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion. Displacement is a vector quantity that refers to "how far out of place an object is"; it is the object's overall change in position.

• Speed and velocity :- Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object's movement.