PHYS 1020 Lecture Notes - Displacement (Vector), Speedometer
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Sig digs reliably known digits of a measurement. 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! 17. 5 km/ hr x 1000m/ 1km x 100cm/ 1m x (1h/60 min) = hr / 60 min . Ans 17. 5 x 105 / 60 = 8. 10. Kinematics- description of motion by use of : Scalar: measured quantity that has only a size/magnitude (no direction) In physics: the arithmetic is different when dealing with vectors compared with scalars. In 1-d no arrow needed, us + & -! 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) (vector) 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. straight line distance between start and finish)