Newton's Second Law

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8 Terms

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Newton's Second Law

  • When a net (or unbalanced force) acts upon an object, it accelerates in the direction of the net force

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Acceleration varies…

to the net force on it and inversely to its mass

Fnet↑ acceleration ↑

mass ↑ acceleration ↓

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A force acts on an object producing an unknown acceleration. What must happen to the force to maintain the same acceleration if…

a. Mass is doubled

b. The mass is cut in half

a. add more force (double)

b. remove force (half)

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Scales and Weight

-Bathroom scales…

measure weight not mass

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Mass is the …

amount of matter that an object has

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Weight is the…

Force of gravity on the object

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Weight (definition)

force exerted on an object due to gravity

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Weight

  • On or near the Earth’s surface, the acceleration due to gravity, g is constant

    • g = 9.8 m/s2

  • Force of gravity: Fg = mg

  • Also called object’s weight

  • Always directed downward toward the center of the planet