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finals phy.science10

QuestionAnswer
acceleration can be what three changes? positive, negative, or zero
helpful vs. harmful friction helpful- brake pads in your car bowling ball on a bowling lane harmful- fluid flowing through a pipe
kinetic vs. static friction kinetic- car driving down a road static- car parked in a drive way
kinetic vs. static friction which is greater kinetic
positive vs. negative acceleration positive acceleration- a car moving forward negative acceleration- car is at the top of the hill and it goes backward
speed vs. velocity speed- how fast your going velocity- a speed that includes a direction
ways to increase/decrease friction increase friction- adding something slippery decrease friction- roughen the surface
the combination of all the forces acting on an object net force
whats newton's first law an object at rest remains at rest and an object in motion maintains its velocity unless it experiences unbalanced forces
describes the effect of an unbalanced force on the motion of an object newton's second law
force= mass times acceleration
for every action there is an equal and opposite reaction newton's third law
newton's third law is also called law of action and reaction
all matter is affected by gravity
when gravitational force increases so does mass
when gravity is the only force acting on an object, the object is said to be in free fall
because weight is a force the si unit of weight is the newton
weight is different from mass
weight influences shape
newton's first law is sometimes called law of inertia
object has less inertia than an object with a larger mass
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