speed = distance time

distance
speed = time
distance
velocity =
+ direction
time
Micah threw a football 75 meters in 3 seconds. How fast did the football travel.
Speed or Velocity?
A bee flew West to sting Sammy. It flew 3 meters in 1.25 seconds. How fast was the bee flying?
Speed or Velocity?
Speed and Velocity Math Problems
s = d
d
v = + direction
t
t
Problem: A car traveling at a constant speed covers a distance of 750 m in Step 1
Pull
25 s. What is the car's speed?
What do you know?
Step 2
What do you NEED to know?
Equation used?
s = Step 4
d
t
Substitute and Solve
750 m
= 30 m/s
s = 25 s
Pull
Step 3
Pull
speed
Pull
distance = 750 m
time = 25 s
Speed and Velocity Practice Problems
d
t
v = + direction
1) The train travels 183 miles North to Greenville. It took 3 hours to reach its destination. What was the trains velocity?
d =
t =
v =
dir =
183 miles
= 61 miles/hour North
3 hours
s = d
t
2) In 6.19 seconds, Jack ran 32.188 meters. How fast was Jack running?
d = t =
s =
32.188 meters
6.19 seconds
= 5.2 m/s
Using the DST triangle
d = st
d
d
s = t
S
t
t = d
s
Pull
Units used in the DST triangle
Place the units in the part of the triangle that they are units for.
miles
m/h
minutes
meters
m/s
seconds
mph
km
Problem: A wasp is flying toward you at 8.2 m/s. You are stunned and cannot move. It takes 2.0 seconds for the wasp to sting you. How far did the wasp travel? 1. What do you know?
2. What do you need to know?
Icon_munis.exe
d
3. Equation used?
S
t
4. Substitute and Solve (Remember units!)
How fast does he go?!
1. What do you know?
2. What do you need to know?
d
3. Equation used?
4. Substitute and Solve (Remember units!)
S
t
Create and Race
In pairs, create three to four speed or velocity problems (1­2 per person). ­Be sure to include proper units
­Be sure to make a problem solving for each variable
­You have 10 minutes
I will pick ten questions for you to answer.
Prepare your sheet with your triangle, and for each problem the variables you will need for the problems.
Problem set up:
d =
s =
t =
direction = (Hint: May not always be necessary)
Create and Race
First person to successfully answer all of the questions correctly will win a draw from the "candy stash".
Everyone must complete the problems to turn in for a grade.
BEST OF LUCK!
On your mark.
Get set.
1
GO!!!!
Pull
Wrap­up
Fill in the blanks with the correct words. Drag the orange star to the blue star to check your answers.
The equation for __________ is __________ divided by __________. __________ uses the same equation, except it also gives a __________.
Drag to star
velocity
distance
speed
direction
time
Resources
Slide 2 and 3: Image obtained from www.physicsclassroom.com/Class/1DKin/U1L1d6.gif
Slide 10: Usain Bolt Video from YouTube
Slide 13: Checkered flag image from Jim Chou at http://www.virtuallandmedia.com/world­flag2.htm#checkered
Race car driver image from Animation Library at http://www.animationlibrary.com/animation/18954/Fast_racer/
Content: The FANTASTIC science department at West Ashley High School
Attachments
checkeredflag1.gif
fast_racer.gif
Lesson Plan­ Introduction to Speed and Velocity.doc
Start Your Engines­SoundBible.com­1300252951.wav
YouTube ­ The fastest man in the world Usain Bolt WR 9.58 100m sprint.avi