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PHYS 1020 (10)

Melissa Williams (2)

Lecture

Recap:

- 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

1km= 1000m

100cm= 1m

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 105 / 60³ = 8.10

One Dimensional (1-D) KINEMATICS

Kinematics- Description of Motion by use of :

- WORDS (terminology)

- DIAGRAMS (graphs)

- EQUATIONS

- 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 16th, 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)

(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)

Q1! : Car goes from point a –b. after it arrives at its destination, the magnitude of its

displacement is:

D) Either smaller than or equal to!

The distance the object travelled

SPEED: time rate of change of distance (m/s) (SCALAR)

VELOCITY: time rate of change of displacement (m/s) (VECTOR)

Average Speed: time rate of change of total distance, defined over a particular period of

elapsed time (SCALAR)

Instantaneous speed: speed at any instant -> Speedometer reading (SCALAR)

Average velocity- time rate of change of total distance, defined over a particular period of

elapsed time (Scalar) (total displ. Over total time)

Instantaneous Velocity: velocity at any instant -> speedometer reading but also must

include direction of motion at that moment (VECTOR)

EX. Max is driving to charlie’s house, which is 4.5km away. The speed limit is 50km/h.

if it takes max 6.0 mins to get to charlies house, does max exceed the speed limit at any

point? ANS: c) not enough info provided d/t = 4.5/ 6/60 = 45km/h = AVERAGE

SPEED) at any instant he could have been going past 50 km/h!!

Wednesday, SEPTEMBER 28 TH

slides & notes posted on courselink for weds. & Friday!! – only copied important things he said.

EX. of constant acceleration:

objects in “free fall” (ignore air resistance)

acceleration due to gravity : g= 9.8m/s2 (DOWN)

ie. all objects fall towards earth with a constant acceleration of g.

use constant acc. equations to describe motion – Replace x With Y

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###### Document Summary

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)

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