Motio n An object is in motion when it changes it position relative to to reference point .
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MotionAn object is in motion when
it changes it position relative to to reference point.
2 Ways to Describe Motion
1) Speed
2) Velocity
SpeedThe distance an object travels in a givenamount of time.
100 meters
10 seconds
Calculating SpeedDistance
TimeSpeed =
measured in units of: meters per second (m/s)
s =dt
Showing Your WorkStep 1: Write down the formula.
s =dt
100 meters
10 seconds
Showing Your WorkStep 1: Write down the formula.
Step 2: List the parts of the formula and what they are worth from the problem.
s =dt
d =t =
100 meters
10 seconds
100 m10 s
Showing Your WorkStep 1: Write down the formula.Step 2: List the parts of the formula
and what they are worth from the problem.
Step 3: Rewrite the formula with the values.
s =dt
d = 100 mt = 10 s
100 meters
10 seconds
s =100 m10 s
Showing Your WorkStep 1: Write down the formula.Step 2: List the parts of the formula
and what they are worth from the problem.
Step 3: Rewrite the formula with the values.
Step 4: Crunch the numbers on a calculator.
Showing Your WorkStep 1: Write down the formula.Step 2: List the parts of the formula
and what they are worth from the problem.
Step 3: Rewrite the formula with the values.
Step 4: Crunch the numbers on a calculator.
Step 5: Write down the answer and include the units.
s =dt
d = 100 mt = 10 s
100 meters
10 seconds
s =100 m10 s
s = 10 m/s
Your final calculation should look like this:
s =dt
d = 100 mt = 10 s
s =100 m10 s
s = 10 m/s
s = 10 m/s
Grading Calculationss =
dt } 1 pt.
d = 100 mt = 10 s } 6 pts.
s =100 m10 s
} 5 pts.
} 3 pts.
15 pts. total
VelocitySpeed in a given direction.
100 meters
10 seconds
West
Calculating VelocityDistance
TimeVelocity =
measured in units of: meters per second (m/s)
v =dt
Difference Between Speed & Velocity
Speed Velocity
distance distance
time time
direction
Accelerationthe rate at which velocity changes
or
the change of velocity over time
10 m/s25 m/s
5 sec
Calculating Acceleration
acceleration = (final velocity – initial velocity)
time
measured in units of: meters/second/second (m/s2)
a = (vf - vi)t
Showing Your Work
a = (vf - vi)
tvf =vi =t =
a = (25m/s – 10 m/s)
5 sec
25 m/s
10 m/s5 sec
a = 3 m/s2
25 m/s 10 m/s5 sec
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