- Uncertainty is possible error in measurement.
- Sig digs –reliably known digits of a measurement
- Manipulation of sig digs – RULES
- Unit conversion
Reference textbook for today 1-19 to 1-20 & 2-1 to2-6
Note read text sections 1.1-1.4 not all covered In class!
Make 17.5 km/hr³ to cm/min³
60 min= 1hr
17.5 km/ hr³ X 1000m/ 1km X 100cm/ 1m X (1h/60 min) ³ = hr³/ 60³ min³
ANS 17.5 X 10 / 60³ = 8.10
One Dimensional (1-D) KINEMATICS
Kinematics- Description of Motion by use of :
- WORDS (terminology)
- DIAGRAMS (graphs)
- Terminology (language) of motion
SCALAR vs. VECTOR
SCALAR: measured quantity that has only a size/magnitude (NO DIRECTION)
Ex. Speed, mass, distance, time, energy, temperature
VECTOR: has both magnitude and direction
Ex. How to find the athletic centre? 150m (EAST)
In Physics: the arithmetic is different when dealing with vectors compared with scalars
Ex. Distance (Scalar) vs. displacement (vector)
In 1-D no arrow needed, us + & -! To show direction.
LECTURE 3 – SEPTEMBER 16 , 2011! Text ref: 1-19 to 1-20
Distance- how far an object moves during motion (S.I. unit metre) (SCALAR QUANT.)
Displacement- straight line from initial to final points in specified direction (m)
Displacement is a vector quantity- arithmetic (rules for addition, subtraction and
multiplication) not the sane as for scalars
- Indicates the change in position from the starting point to the final point (ie.