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Chapter 1
Section 1: What is Physics?
Physics
• Anything that deals with temperature, size, motion, position, shape or color involves physics
...
001 cubic meters of water

(

1
1
1
)( )( ) = 0
...
33564095 x 10-9s
The mass of a specific platinum-iridium alloy cylinder
9,192,631,770 times the period of radio wave emitted
from a cesium- 133 atom

average solar days
SI uses prefixes
Numbers are expressed in powers of 10; 1 x 1017m or 1 x 10-19m
...
2mm x

1𝑚𝑚𝑚𝑚

10−3
10−3

Units don’t cancel: 37
...
2 x 104

= 3
...
3 + 5
...
15  round off
103
...
24 becomes 30
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35 = 658
...
25 becomes 32
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65000 becomes 32
...
49 becomes 22
...
7511 becomes 54
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75 becomes 54
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3500 becomes 79
...

• Example: if a gecko climbs up the tree from the 20cm marker (initial position) to the 80 cm marker, then it
retreats to the 50 cm marker (the final position)
...
However, the
displacement is only 30 cm because displacement = (50 cm – 20 cm) = 30 cm
...

Displacement can be positive (right) or negative (left); one dimension motion!
Average velocity =

𝑐𝑐ℎ𝑎𝑎𝑎𝑎𝑎𝑎𝑎𝑎 𝑖𝑖 𝑖𝑖 𝑝𝑝𝑝𝑝𝑝𝑝𝑝𝑝 𝑝𝑝 𝑝𝑝 𝑝𝑝 𝑝𝑝

=

𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑

Velocity: the time rate of change of position of a body in a specified direction
...
02m/s to the east
...
02m/s
∆ t = 137
Unknown:
∆x = ?
Rearrange the average velocity equation to solve for displacement
Vavg =

∆x
∆t

∆ x = (Vavg) ( ∆ t)
∆ x = (6

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