Motion in One Dimension Ch 2

Read and Define  Take Home Lab #1  Read Chapter 2  Complete the 6 vocabulary on page 67

One Dimensional Motion  Simplest form of motion  Motion takes place over time and depends upon a frame of reference  Frame of Reference - a system for specifying the precise location of objects in space and time (See Visual CD for more information)

Displacement  See Visual CD for information  Displacement- (Delta x or  x) the change in position of an object  Delta-  - change in a quantity (final – initial)   x = x f - x i If along the x axis   y = y f - y i If along the y axis

Displacement  Turn to page 41 and look at figure 2  What is the Gecko’s displacement?  85cm - 22 cm = + 63 cm

Displacement From where you start to where you end it does not matter where you’ve been.

Displacement  Displacement is not always equal to the distance traveled  Displacement can be positive or negative  Answer the Conceptual Challenge #1 and 2 on page 41

Scalar VS Vectors  Scalar – quantities with just magnitude Ex: 55mph  Vector- quantities with magnitude and direction Ex: 55mph, East

Scalar Vector  Distance displacement  Speedvelocity acceleration acceleration  Time may be considered its own category  The Physics 500 Activity

Variable and Units Variable and Units  Distance d m  Speed vm/s  Time  ts  Displacement  xm  Velocityvm/s variable- letter used in equation unit - measurement

Average Speed  average speed = distance traveled time of travel time of travel V = d t What is John’s average speed if he drove 10.0 km, East and then drove 10.0 km, West in 15 minutes km / 15 min = 1.3 km / min

Average Velocity V avg =  x V avg =  x  t  t  Graphing Student Motion Activity

Average Velocity  Average velocity = displacement change in time change in time V avg =  x = x f - x i  t t f - t i  t t f - t i What is John’s average velocity if he drove 10.0 km, East and then drove 10.0 km, West in 15 minutes. 0 km / 15 min = 0 km / min

Average Speed and Average Velocity  Picture Practice problems  Practice Problems  Pg  Pg 47 #3

Slope  Slope = rise run run  slope = rise =  x = average velocity run  t run  t Instantaneous Velocity- the velocity of an object at some instant

Slope Pg 46 Figure 6 Pg 47 #6