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MKS System
Meter, Kilogram, Seconds
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Kinematics
The study of the motion of an object without regard to the causes of the motion.
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Average Velocity (v) equals
- Change in displacement divided by change in time
- x/t
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Average x =
Vi(t) + (1/2)at2
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Gravitational acceleration
g = (average v)/t
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Law of inertia
- If there is no net force acting on an object it will remain at rest or in uniform motion.
- If an object is in constant speed in a straight line its net force is 0.
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Law of Acceleration
- If there is a net force acting on an object the object will accelerate. The acceleration is directly proportional to the net force & in the same direction.
- Acceleration is inversely related to the mass.
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Law of Interaction
- For each action there is an equal, and opposite, reaction.
- Forces always occur in pairs.
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Weight
- Fw=mg
- Downwards, toward center of the Earth
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Normal Force/Perpendicular Force
- Contact force with surface
- Perpendicular with the surface
- Fn = mgCos
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Frictional Force
- How hard the surfaces are pressed together.
- f = mN
- m
= F/N
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Potential
Ability to do work. Stored energy because of an objects position or condition.
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Position
gravitational potential energy
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Condition
compressed spring
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Gravitational Potential Energy
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Conservation of mechanical energy
v2 = 2gh
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Kinetic Energy
KE = (1/2)mv2
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Elastic Collision
- Sum of pi = Sum of pf
- Sum of (1/2)mv2 initial = Sum of (1/2)mv2final
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Conservation of momentum
Ft = average p
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Centripetal Acceleration
ai = v2/r
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Centripetal Force
F = (mv2)/r
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Change in x =
(1/2)(vi + vf) average t
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Mechanical Energy
ME = KE + (sum of)PE
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Change in momentum
delta p = F(delta t)
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wavg =
- average angular speed
- angular displacement/time interval
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Fg =
- G(m1m2/r2)
- G=6.673 x 10-11
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