Mass and weight

MASS AND WEIGHT
MASS AND WEIGHT
Physics Project
Physics Project
By: Salim DogaN ZENGIN



GRAVITATIONAL FORCE
GRAVITATIONAL FORCE


Hang something from the end of a spring
Hang something from the end of a spring
balance and you can measure the downward pull
balance and you can measure the downward pull
from the Earth. The pull is called a
from the Earth. The pull is called a
gravitational
gravitational
force.
force.




No one knows what causes gravitational
No one knows what causes gravitational

force. But several things are known about it: All
force. But several things are known about it: All
masses attract each other. The greater the
masses attract each other. The greater the
masses, the stronger the pull. The closer the
masses, the stronger the pull. The closer the
masses, the stronger the pull.
masses, the stronger the pull.





GRAVITATIONAL FORCE
GRAVITATIONAL FORCE
The pull between small masses is far too
The pull between small masses is far too
weak to measure – less than one millionth
weak to measure – less than one millionth
of a Newton between you and the person
of a Newton between you and the person
the next to you for example. But the Earth
the next to you for example. But the Earth
has a such a huge mass that the
has a such a huge mass that the
gravitational pull is strong enough to hold
gravitational pull is strong enough to hold
most things firmly on the ground.
most things firmly on the ground.

WEIGHT
WEIGHT


Weight is another name for the gravitational
Weight is another name for the gravitational
force from the earth.
force from the earth.


As weight is a force, its unit is the Newton.
As weight is a force, its unit is the Newton.


On the earth, each kilogram of matter weighs
On the earth, each kilogram of matter weighs
10 newtons.
10 newtons.


People often use the word ‘weight’ when
People often use the word ‘weight’ when
they really mean ‘mass’. If something has mass
they really mean ‘mass’. If something has mass
50 kg it has 500 N weighs.
50 kg it has 500 N weighs.

Go to the Moon. Even better, go deep into
Go to the Moon. Even better, go deep into
space, for away from all planets.
space, for away from all planets.

MASS AND WEIGHT
MASS AND WEIGHT



As different planets have different masses and sizes,
As different planets have different masses and sizes,
your weight would vary from one place in the Universe to
your weight would vary from one place in the Universe to
another. Take the case of a person with a mass of 50 kg :
another. Take the case of a person with a mass of 50 kg :


50 kg MASS WEIGHT
50 kg MASS WEIGHT
deep in space 50kg zero
deep in space 50kg zero


near surface of the moon 50kg 80 N
near surface of the moon 50kg 80 N
near surface of Jupiter 50kg 2700 N
near surface of Jupiter 50kg 2700 N
near a black hole 50kg 100 million
near a black hole 50kg 100 million