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