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PHYS1000: Chapter 3 
Linear Motion
Why
: The question, “how does something move?” was
the driving force behind the development of physics.
Examples
: Driving a car along a highway, dropping a ball,
bowling
Types of Linear Motion
We are going to consider two types of linear motion
(motion of objects in straight lines) problems:
Horizontal Motion
At constant speed
At constant acceleration
Vertical Motion
At constant acceleration (near the Earth’s surface)
Units and Symbols
Throughout this class, we will use the Metric System
or MKS units
M  meters (length)
K  kilogram (mass)
S  seconds (time)
C  coulomb (charge)
Most other units we will use will be constructed
from combinations of these units.
Example: Force (N  newton), 1 N = 1 kgm/s
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Physics and math (
algebra!!
)
Was I really supposed to remember that?
We have to use some algebra to solve problems. Mostly,
we will have to rearrange and solve a few equations.
If you have problems  SEE ME IMMEDIATELY!!
Some terminology
Position, x  describes location of an object
Symbols:
x  position, d  distance, t  time
d = (x
2
 x
1
)
Units:
m (meters)
Velocity, v  a change in position
over time
v = d/t = (x
2
 x
1
) / t
d = v*t
Units:
m/s
Acceleration, a  a change in velocity
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 Spring '08
 Thomas
 Physics, Force

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