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Ch. 13Lesson 2What are forces?
force•push
•pullpush
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
iron, nickel, cobalt
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 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
force X distance = work
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