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8/10/2019 Gravity Mass and Weight
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True or false?
If the earth stopped spinning we would float into space.
There is no gravity on the moon.
NASA have an anti-gravity room where gravity can be turned offand people can float.
It is possible to shield the force of gravity by using lead or othermaterials.
Isaac Newton discovered gravity.
Nottingham Forest won the Champions league in 1979 and 1980.
You have no mass in space.
There is no gravity in space because you are far from the earth. Weight is measured in kilograms.
There is no gravity in space because space is a vacuum.
If we could suck all the air out of the classroom, we would floataround.
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All false!
If the earth stopped spinning we would float into space.
There is no gravity on the moon.
NASA have an anti-gravity room where gravity can be turned offand people can float.
It is possible to shield the force of gravity by using lead or othermaterials.
Isaac Newton discovered gravity.
Nottingham Forest won the Champions league in 1979 and 1980.
You have no mass in space.
There is no gravity in space because you are far from the earth. Weight is measured in kilograms.
There is no gravity in space because space is a vacuum.
If we could suck all the air out of the classroom, we would floataround.
Only this one is
true!
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Target and Word sheets
Can you stick the target
and word sheets for the
new topic into your book
please?
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Todays lesson
9Ja Know what causes weight.
9Ja Know which direction down is.
9Ja Know how gravity affects objects.
9Ja Know how to work out the weight of an object.
9Jb Know why gravity is different on other planets.
9Jb Know how to calculate weight on other planets.9Jb Know how gravity changes with distance.
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Gravity
What is gravity?
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Gravity
Gravity is a force between ALL objects!
Gravity
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Gravity
The size of the force depends on the mass of
the objects. The bigger they are, the bigger
the force!
Small attractive force
Bigger attractive force
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Gravity
The size of the force also depends on the
distance between the objects.
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Gravity
We only really notice the gravitational
attraction to big objects!
Hola! Como estas?
8/10/2019 Gravity Mass and Weight
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Gravity
The forceof gravity on something is called
its weight. Because it is a forceit is
measured inNewtons.
Weight
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Mass
Massis a measure of the amount of material
an object is made of. It is measured in
kilograms.
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Mass and weight
Massis a measure of the amount of material
an object is made of. It is measured in
kilograms.
Weightis the force of gravityon an object.
It is measured inNewtons.
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Calculating weight
The force of gravity on one kilogram is
called the gravitational field strength. It s
measured inNewtons per kilogram(N/kg)
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Calculating weight
To calculate the weight of an object you
multiply the objects massby the gravitational
field strengthwherever you are.
Weight (N) = mass (kg) x gravitational field strength (N/kg)
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Example
The gravitational field strength on earth is
around 10 N/kg. What is your weight if your
mass is 45 kg?
Weight (N) = mass (kg) x gravitational field strength (N/kg)
Weight (N) = 45 kg x 10 N/kgWeight =450 N
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Easy isnt it?
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Now lets try some questions!