5th grade-ch. 13 lesson 2 what are forces
TRANSCRIPT
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Ch. 13Lesson 2What are forces?
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force•push
•pullpush
pull
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force•measured in
newtons
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gravity•Earth’s gravity pulls other objects toward its center
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weight•amount of gravitational pull on every other object
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pendulum•swings b/c of gravity
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magnetism•force that pushes & pulls on other objects made of iron, nickel & cobalt
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iron, nickel, cobalt
AGNETS, INC.
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strongest force of attraction
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friction•force when 2 materials rub against each other
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friction•slows down motion of an object
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work•energy used when a force moves an object
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work•not done when the position of an object does not change
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When work is doneActivity 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
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force X distance = work