Question

Doservation
Reading Table for determining mass (M) of the solid body
Least count of spring balance =
Mass of solid body
Reading of spring balance Reading of spring balance
So without solid body (M) with the solid body (M2)
Mean mass of solid body M=M2_M1
1
2
3​

Answer 1

Answer:

Theory

Density: The density of a substance is defined as the mass per unit volume,[D= \frac { M }{ V } ]

Here, D = Density of the body

M = Mass of the body

V = Volume of the body.

S.I. unit of density = Kgm-3 or Kg/m-3

c.g.s. unit of density = g/cm-3 or g cm-3

Floating bodies: The density of water is 1 g/cm3 (c.g.s. system) and 1000 kg/m3 (S.I. system).

Case (a) If the density of a body is more than 1 g/cm3 or 1000 kg/m3 then the body will sink in water.

Case (b) If the density of a body is less than 1 g/cm3 or 1000 kg/m3 then the body will float on water.

Case (c) If the density of a body is same i.e. 1 g/cm3 or 1000 kg/m3 then the body will half float and half submerge in water.

ncert-class-9-science-lab-manual-density-of-solid-1

Weight

The force due to the gravitational attraction of the earth that acts on a body is called weight.

(Weight) Force = mass x acceleration.

Force = mass x acceleration due to gravity (g)

Force = mass x g

i.e Weight = m x g

Weight of a body = Force on the body.

S.I. unit = Newton = 1 kg m/s2

N =1 kgf= 1 kilogram force,

i.e g = 9.8 m/s2

Weight is measured by spring balance

Explanation:

Hope It Will Help You..........