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force - ✔✔mass × acceleration
vector quantities - ✔✔forces that has both size and direction
equilibrium - ✔✔a stable situation in which forces cancel one another
velocity - ✔✔the speed and direction of a moving object
acceleration - ✔✔the rate at which velocity changes
pressure - ✔✔force (in pounds) ÷ area (in inches)
work - ✔✔force × distance
tension is measured in - ✔✔pounds-force or newtons
work is measured in - ✔✔foot-pounds
power - ✔✔work ÷ time
power is measured in - ✔✔horsepower (hp)
1 horsepower - ✔✔33,000 foot-pounds per minute or 550 foot-pounds per second
mechanical advantage - ✔✔when a machine multiplies the force you use
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