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Examples of Inertia in everyday life: When travelling in a vehicle, you will lurch forward when the car stops suddenly. When the car turns left, you will lean to the right.

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 field strength




Definition: The inertia of an object is the reluctance of the object to change its state of rest or motion.

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 Earth. (Gravity)

It is a force and has direction.

As we learnt before, weight = mg.

SI unit: newton

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 volume.

For pure substances, it is a fixed property.

SI unit : kg/m^3

What we learnt before : density= mass/volume.

Gravitational Field Strength


Relation to other quantities

Gravitational field:

The closer two bodies are, the stronger the attraction.