Measurements & Kinematics Flashcards
1
Q
7 SI units
A
kg, m, s, A, K, mol, cd
2
Q
Cos rule
Sin rule
Change in velocity
A
c^2 = a^2 + b^2 -2abcos c
A/sina = B/sinb
Vf-Vi or (-Vi)+Vf
3
Q
Systematic error
A
An error is systematic if repeating the measurement under the same conditions yields readings with error of same magnitude and sign
4
Q
Random error
A
An error is random if repeating the measurement under the same conditions yield readings with error of different magnitude and sign
5
Q
Accuracy
A
Closeness of a reading on a measurement to the true value of the quantity being measured
6
Q
Precision
A
Level of uncertainty in an instrument’s scale
7
Q
How to calculate uncertainty
A
EG V=pi r^2 h
delta V/V= 2 delta r/r + delta h/h
8
Q
4 formulas
A
v=u+at
s=ut+0.5at^2
v^2=u^2 +2as
s=((u+v)/2))/t
