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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?

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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!


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