MASS AND WEIGHT

-is a measure of the quantity of matter in an object at rest relative to the observer.

-mass is scalar quantity
-SI unit of mass is kilogram(kg)
-sometimes use gram(g) [1000g=1kg]

Mass is the property of an object that resists change in motion.

The greater the mass = the more difficult it is to speed it up, slow it down, or change its direction

-The force acting on an object due to gravitational attraction

-weight is a force, so it is a vector quantity
-SI unit of force are Newton(N)

• Objects stay firmly on the ground

• Objects will always fall to the ground

• Satellites are kept in orbit

Because of weight:

WHERE:

W = weight (N)
m = mass (kg)
g = gravitational field strength (N/kg)

acceleration of free fall, or acceleration due to gravity.

Also known as:

The force per unit mass acting on an object in a gravitational field.

Defined as:

its weight will differ depending on the strength of the gravitational field on different planets

An object’s mass always remains the same