Question

U of two independent motions. Name thes
13. (1) What is the difference between mass and weight of the body?
(ii) State SI unit of mass and weight.
(iii) How does mass of body changes when it is taken into space?
14. (a) Give two points of difference between distance and dinn​

Answer 1

Answer:

13) i) Mass;-

=} the amount of matter contained in a body is called its mass.

=} the mass of a body is constant and does not change with place and position of the body.

=} the mass of a body can never be zero.

=} the mass of a body is measured by simple beam balance or physical balance.

Weight:-

=} the weight of a body is the force with which it is attracted by the earth towards its centre.

=} the weight of a body depends on the force of gravity and thus changes from place to place.

=}the weight of the body can be zero if no force of gravity acts on the body.

=} the weight of a body is measured by a spring balance.

ii) the SI unit of mass is kilogram (kg).

the SI unit of weight is Newton (N).

iii) Thus, when the body is taken into any deep space, its mass never changes. The weight of the body might change with the change of place.

14) a) Distance:-

i) it is the length of the path travelled by the object in a certain time.

ii) it is a scalar quantity i.e., it has only the magnitude.

Displacement:-

i) displacement of a body is defined as a shortest possible distance covered by it between its initial and final positions.

ii) it is a vector quantity i.e., it has both the magnitude and direction.