Alison Lindsay
Physics midterm
12/5/09
Sig Figs
When multiplying and dividing you can only have the amount of significant digits as the smaller number in the
equations.
When adding and subtracting the answer goes out to the lowest place of the first 2 numbers.
Accuracy
Er= (should have gotten measured/ should have gotten) *100=%
Precision
Reproducibility/ being able to get the same number over and over again
Linear Kinematics
•
Position
o
The position of an object is its location relative to some reference points
o
Symbols include x, y, z ,r, s
o
Units ft, mi, m ,km
•
Displacement
o
The change in position of an object
o
Delta x= x2x1
o
vector
•
Distance
o
If a change in position occurs, then length of the path taken
o
Scalar
•
Velocity
o
VAverage= Delta x/ delta t
o
Displacement/ time
o
vector
•
Instantaneous speed and velocity are determined by specific points in time
•
Average speed= speed/ distance
•
Acceleration
o
Change in the velocity/ change in time
o
Vector
o
(m/s)/s or m/s^2
•
Constant acceleration
o
Vaverage= ½ max v and occurs at the mdpt of the total time
o
Freefall
Only gravity
9.8 m/s^2
Mass v. Weight
•
Mass kg; always the same; how much matter
•
Weight N; relationship between an object and a body
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 Spring '11
 Martin
 Force, Kinetic Energy, Rigid Body

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