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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
Acceleration varies…
to the net force on it and inversely to its mass
Fnet↑ acceleration ↑
mass ↑ acceleration ↓
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)
Scales and Weight
-Bathroom scales…
measure weight not mass
Mass is the …
amount of matter that an object has
Weight is the…
Force of gravity on the object
Weight (definition)
force exerted on an object due to gravity
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
Note 
Flashcard (59)