gravity
DESCRIPTION
gravityTRANSCRIPT
PRESENTATION ON
GRAVITY
PRESENTATION ON
GRAVITY
PRESENTATION BY
PRESENTATION BY
ANJALI. TPHYSICAL SCIENCE
13386001
ST.THOMAS TRAINING COLLEGE,MUKKOLAYKKAL
ANJALI. TPHYSICAL SCIENCE
13386001
ST.THOMAS TRAINING COLLEGE,MUKKOLAYKKAL
GUESS THE WEIGHT OF THE CHOCOLATE BAR
REMEMBER TO INCLUDE UNIT OF MEASUREMENT
•It'1.5 N
but why?
•It'1.5 N
but why?
• Mass is a measure of how much matter or particles an object has.
• Weight is a measure of how strongly gravity pulls on that matter
• So if you were to travel to the moon, where gravity is weaker, what would change?
• Just remember that the weight of an object depends on where it is, while its mass stays the same.
• Mass is a measure of how much matter or particles an object has.
• Weight is a measure of how strongly gravity pulls on that matter
• So if you were to travel to the moon, where gravity is weaker, what would change?
• Just remember that the weight of an object depends on where it is, while its mass stays the same.
• I have two bags, both the same shape and size. One bag contains feathers and the other contains bricks. Which is heavier?..
• Which is heavier a ton of bricks or a ton of feathers?..
• I have two bags, both the same shape and size. One bag contains feathers and the other contains bricks. Which is heavier?..
• Which is heavier a ton of bricks or a ton of feathers?..
Gravity – what is it?Gravity – what is it?• is an attractive force between objects
with mass.• Gravity acts on the Earth by pullingpulling
objects towards its centre.• An object with heavier mass has a
stronger gravitational pull = has a heavier weight.
• is an attractive force between objects with mass.
• Gravity acts on the Earth by pullingpulling objects towards its centre.
• An object with heavier mass has a stronger gravitational pull = has a heavier weight.
Gravity – what is it?Gravity – what is it?Which arrow is pointing Which arrow is pointing the the wrongwrong way? way?
Gravity – what is it?Gravity – what is it?
Yes, it’s this one
Who discovered it?Who discovered it?• It was Sir Isaac Newton
that ‘worked-out’ gravity.• 1643 – 1727• He was the greatest
English mathematician of his generation. His work on optics and gravitation make him one of the greatest scientists the world has known.
• It was Sir Isaac Newton that ‘worked-out’ gravity.
• 1643 – 1727• He was the greatest
English mathematician of his generation. His work on optics and gravitation make him one of the greatest scientists the world has known.
Who discovered it?Who discovered it?
The story goes that he was sitting under an apple tree and an apple fell onto his head. He went to explore why it fell down and came up with a theory and mathematical equation.. He named it GRAVITY.
How do we measure it?How do we measure it?• We measure all forces in
Newton. The effect of gravity gives us our weight - so our weight should always be in Newton.
• It is mass which is measured in kilograms.
• We measure all forces in Newton. The effect of gravity gives us our weight - so our weight should always be in Newton.
• It is mass which is measured in kilograms.
Newtonmeter (also called Forcemeter, Spring balance, and Pullmeter)
Gravity on Earth causes this man to accelerate downwards.
Its effect is the same everywhere.
WEIGHT = MASS x GRAVITY
(N) (kg)
The astronaut has a mass of 80kg but when will he weigh more?
on the Moon on the Earth
Gravity = 1.5 Gravity = 10
Weight = 80 x1.5Weight =
Weight = 80 x 10Weight = 120 N 800 N
NAME OF OBJ ECT
MASS (grams)
To
convert in to KG we (÷1000)
MASS (Kilograms)
The pull
ofGravity is 10 so we (x10)
WEI GHT (Newtons)
A packet of crisps
125g
A car
1500kg
10 bags of sugar
10,000g
A football
400g
A mobile phone
250N
THANK YOUTHANK YOU