1.4 gravity

§1.4 Gravity
Gravity
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Slide 1: Diapositive
Natuurkunde / ScheikundeMiddelbare schoolhavo, vwoLeerjaar 1

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§1.4 Gravity
Gravity

Slide 1 - Diapositive

Learning goals
    • Explain the cause of gravity

    • Describe the difference between mass and weight.

    • Explain gravitational field strength

    • Calculate weight, mass and gravitational field strength

    Slide 2 - Diapositive


    What is the cause 

    of gravity?
    See the video, figure out what their final conclusion is on what gravity is. Write it down after the video.

    Slide 3 - Diapositive

    Slide 4 - Vidéo

    Attractive force between any two object with mass.

    Slide 5 - Diapositive

    The difference between 

    mass and weight

    Slide 6 - Diapositive

    Slide 7 - Diapositive

    Mass and weight
    Mass
    • How much matter something is made of
    • does not change with location
    • Measured in kg
    Weight
    • the force of gravity acting on a specific object
    • Depends on the gravational field strength something is in
    • Measured in newton

    Slide 8 - Diapositive

    • all mass applies an attractive force on all other mass. The gravitational force.

    • the strength of this attractive force depends on the amount of mass (in kg) and the distace.

    • The more mass something is made of, the greater its gravitational force is on other masses.

    The larger the distace the lesser  the force of gravity.
     
    • the amount of newtons a body of mass applies to other masses per kilogram is called its gravitational field strength (N/kg)



    Gravitational force

    Slide 9 - Diapositive

    Is the force experienced(in N) per unit mass by an object. And is measured in (N/kg)
    Gravitational field strength

    Slide 10 - Diapositive

    The amount of newtons a body of mass applies to other masses per kilogram (N/kg)
    Gravitational field strength
    For example:
    The gravitational field strength on Earth is 10 N/kg. Means a mass of 1 kg experiences a force of 10 N.

    The gravitational field strength on Jupiter is 23 N/kg

    Slide 11 - Diapositive

    weight=massgravitationalfieldstrenght
    (N)
    (kg)
    (N/kg)

    Slide 12 - Diapositive

    weight=massgravitationalfieldstrenght
    w=mg
    (N)
    (kg)
    (N/kg)

    Slide 13 - Diapositive

    weight=massgravitationalfieldstrenght
    w=mg
    • W: weight (N)
    • m: mass (kg)
    • g: gravitational field strength (N/kg)
    (N)
    (kg)
    (N/kg)

    Slide 14 - Diapositive

    Slide 15 - Diapositive

     11.3 kg
    21.7 kg
    44.8 kg
    Weight (N)
    On earth
    Weight (N)
    On mars
    Weight (N)
    On planet Z
    135.6
    260.4
    537.6
    Weight mass x gravitational field strength
    See the table on the right.

    a) fill in the weight of the masses on earth and mars.

    b) calculate the gravitational field strength of planet Z
    Gravitational field strength earth = 10 N/kg
    Gravitational field strength mars = 3.7 N/kg

    Slide 16 - Diapositive

     11.3 kg
    21.7 kg
    44.8 kg
    Weight (N)
    On earth
    113
    217
    448
    Weight (N)
    On mars
    Weight (N)
    On planet Z
    135.6
    260.4
    537.6
    Weight mass x gravitational field strength
    See the table on the right.

    a) fill in the weight of the masses on earth and mars.

    b) calculate the gravitational field strength of plante Z
    Gravitational field strength earth = 10 N/kg
    Gravitational field strength mars = 3.7 N/kg

    Slide 17 - Diapositive

     11.3 kg
    21.7 kg
    44.8 kg
    Weight (N)
    On earth
    113
    217
    448
    Weight (N)
    On mars
    41.81
    80.29
    165.76
    Weight (N)
    On planet Z
    135.6
    260.4
    537.6
    Weight mass x gravitational field strength
    See the table on the right.

    a) fill in the weight of the masses on earth and mars.

    b) calculate the gravitational field strength of plante Z
    Gravitational field strength earth = 10 N/kg
    Gravitational field strength mars = 3.7 N/kg

    Slide 18 - Diapositive

    w=mg
    6=32

    Slide 19 - Diapositive

    w=mg
    6=32
    Exercise
    Rearrange the formula to use it to calculate:

    a) mass

    b) gravitational field strength

    Slide 20 - Diapositive

     11.3 kg
    21.7 kg
    44.8 kg
    Weight (N)
    On earth
    113
    217
    448
    Weight (N)
    On mars
    41.81
    80.29
    165.76
    Weight (N)
    On planet Z
    135.6
    260.4
    537.6
    Weight mass x gravitational field strength

    Calculate the gravitational field strength of planet Z
    Gravitational field strength earth = 10 N/kg
    Gravitational field strength mars = 3.7 N/kg

    Slide 21 - Diapositive

    Homework
    Workbook exercises 1.4
    Exercise 1, 2, 3 and E

    Slide 22 - Diapositive

    Learning goals
    • Explain the cause of gravity

    • Describe the difference between mass and weight.

    • Explain gravitational field strength

    • Calculate weight, mass and gravitational field strength

    Slide 23 - Diapositive