by Linn Lett Win Kyi
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Textbook explanation : Mass is the measure of the amount of
matter or substance in a body. The amount of mass a body has
depends on the number and composition of atoms and
molecules that make up the body.
On earth, Gravitation field strength about
10N/kg. Means a 1kg mass will experience a
gravitational pull of 10N
Scientific explanation : Mass is the quantity of inertia possessed by
an object or the proportion between force and acceleration referred to
in Newton's Second Law of Motion. cr:
Gravitation pull is not gravitation
inertia of an object is
the reluctance of the
object to change its
state of rest or
What affects Inertia: The mass
of an object affects the inertia
of an object. The greater the
mass of an object, the greater
the inertia, and it is more
difficult to start or stop it.
units: kg, tonne
It is the force that is a result of the
gravitational pull exerted by the
It is a force and has direction.
Its direction is downwards -
towards the center of the Earth., gravity, Vector quantity
As we learnt before, weight = mg.
SI unit: newton
10N=1kg x 10N/kg
Weight is directly proportional to
the mass of the body.
Gravitational Pull increases
when the mass increase.
The density of a substance is
defined as its mass per unit
For pure substances, it is a fixed property.
SI unit : kg/m^3
What we learnt before :
Gravitational Field Strength
Refers to the size of
gravitational pull acting on
per unit mass
Weight over mass and the
acceleration due to gravity
The closer two bodies are, the
stronger the attraction.