Lesson 7 — Gravity

1.4 Gravity
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1.4 Gravity

Slide 1 - Diapositive

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This lesson
  • The science test 
  • What is gravity?
  • Mass, weight and gravitational field strength
  • The formula for weight

Slide 2 - Diapositive

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Goals
    •  Explain what gravity is in your own words.

    • Define the concepts mass, weight and gravitational field strength.

    •  Name and apply the formula to calculate weight.


    Slide 3 - Diapositive

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    The science test

    Slide 4 - Diapositive

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    What is gravity?

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    The Attractive force between any two object with mass.

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    Read paragraph 1.4
    Write down a definition of the following words. Include their unit. 
    • Mass
    • Weight
    • Gravitational field strength


    Done — do the yellow block exercises of paragraph 1.4

    Slide 7 - Diapositive

    two objects with a different mass

    two situations where the same object has a different weight

    two different gravitational field strength
    Mass

    • The amount of matter (stuff) something is made off (kg).

    Weight
    • The strength of the force of gravity on a specific object (N).
    Gravitational field strength
    • The amount of newtons a body of mass applies to other masses per kilogram (N/kg)

    Slide 8 - Diapositive

    two objects with a different mass

    two situations where the same object has a different weight

    two different gravitational field strength

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    Gravitational field strength earth: 10 N/kg

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    Gravitational field strength earth: 10 N/kg
    Gravitational field strength moon: 1.6 N/kg

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    The formula for weight

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    weight=massgravitationalfieldstrength

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    weight=massgravitationalfieldstrength
    w=mg

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

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    Exercise
    Calculation Procedure
    1. Given
    2. Asked
    3. Formula
    4. Calculation
    5. Check
    Dave has a mass of 83 kg. The gravitational field strength on Earth is 9.8 N/kg. 

    Calculate his weight on Earth.

    Slide 18 - Diapositive

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    Exercise
    Calculation Procedure
    1. Given
    2. Asked
    3. Formula
    4. Calculation
    5. Check
    Dave turns out to be an astronaut! He will be traveling to Mars in the future. the gravitational field strength on Mars is 3.7 N/kg.

    Calculate his weight no Mars.

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    Studying for the test

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    Goals
      •  Explain what gravity is in your own words.

      • Define the concepts mass, weight and gravitational field strength.

      •  Name and apply the formula to calculate weight.


      Slide 21 - Diapositive

      Cet élément n'a pas d'instructions