5th Grade-Ch. 13 lesson 2 what are forces
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5th Grade-Ch. 13 lesson 2 what are forces

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5th Grade-Ch. 13 lesson 2 what are forces 5th Grade-Ch. 13 lesson 2 what are forces Presentation Transcript

  • Ch. 13 Lesson 2 What are forces?
  • force
    • push 
    • pull 
    push pull
  • force
    • measured in newtons
  • gravity
    • Earth’s gravity pulls other objects toward its center
  • weight
    • amount of gravitational pull on every other object
  • pendulum
    • swings b/c of gravity
  • magnetism
    • force that pushes & pulls on other objects made of iron, nickel & cobalt
  • i ron, n ickel, c obalt AGNETS, INC.
  • strongest force of attraction
  • friction
    • force when 2 materials rub against each other
  • friction
    • slows down motion of an object
  •  
  • work
    • energy used when a force moves an object
  • work
    • not done when the position of an object does not change
  • When work is done Activity Work Thinking about a math problem Turning a jump rope Holding a puppy Lifting a puppy Pulling on a locked door Opening an unlocked door Trying to scoop rock-hard ice cream
  • force X distance = work