Unit 5 lesson 1
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Unit 5 lesson 1






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Unit 5 lesson 1 Unit 5 lesson 1 Presentation Transcript

  • Weight, Mass, and The Force of Gravity
    Unit 5 Lesson 1
  • Unit overview
    • In this unit you will be learning about forces and motion.
    • A force is a push or pull exerted on an object.
  • Remember Mass?
    • In Unit 3 you learned that mass is the amount of matter in an object. View slide
    • The quantity(amount) of matter in an object does not change. View slide
    • An object’s mass is constant (does not change).
    • The mass of an object will stay the same regardless of how much gravity acts on the object.
  • Mass and Weight are not the Same Thing
    • Weight is the gravitational force exerted on an object.
    • Weight varies depending on how much gravity acts on an object.
  • Let’s compare mass and weight
    • An object will have the same mass (amount of ) on the moon as it does on Earth.
    • The object’s weight will be different because gravity is different.
    • Objects on the moon weigh about 1/6th of what they weigh on earth.
  • Would you rather weigh yourself on top of a mountain or at sea level?
    • On top of Mt. Everest, you would weigh slightly less than you would at sea level.
  • Gravitational Force
    • Gravity is the force of attraction between two objects.
    • Gravity depends on the masses of the objects and the distance between the objects.
  • Gravity on Earth
    • The gravity on Earth is obvious because it is the force that keeps us on the surface of Earth.
  • Gravity on the Moon
    • Gravity is also the force that keeps the moon in orbit around the earth.
  • Gravity is a Force
    • Gravity is a force, but gravity does not touch an object when it acts on it.
    • Gravity pulls an object and affects the object’s weight.