2. Springing Into Action
http://opencage.info/pics.e/large_7946.asp
The hunt might just be over for this pouncing leopard. A
leopard can run as fast as 60 km/h over short distances and
can jump as high as 3 m. However, a leopard must be more
than fast and strong. To catch its prey, it must also be able to
change its speed and direction quickly.
3. In your Science Journal. . . .
Describe how your motion changed as you
moved from the front door of the school to
our classroom.
4. Possible Science
Journal Answers
• You had to slow down in the crowded
hallway
• You had to change direction to avoid
colliding with other students
• You had to change direction when you
entered the classroom
5. What is Motion?
• All matter is constantly in motion.
• Motion involves change in postion
o An object changes position relative to a
reference point.
o Distance is the total length of the route an
object travels when it moves.
o Displacement includes distance and
direction of the stopping point from the
starting point.
8. Speed
• Distance traveled divided by the time
taken to travel the distance is called
speed.
• The formula can be written as:
o speed = distance/time
• The units for speed (in SI units) is given
as meters per second (m/s)
10. Calculate the speed
Calculate the speed of a swimmer who
swims 100 meters in 56 seconds.
This is what you know: distance = 100 meters
time = 56 seconds
This is what you need to know: speed = ?? m/s
This is the procedure you need to use: s = d/t
s = 100/56
= 1.8 m/s
11. Calculate speed on your own
1) A runner completes a 2) A passenger train
400-m race in 43.9 s. travels from Boston to
In a 100-m race he New York, a distance
finishes in 10.4 s. In of 350 km, in 3.5 h.
which race was his What is the train's
speed faster? speed?
12. Changing Speed
An object can change speeds many times as
it moves from one point to
another, speeding up or slowing down.
13. Average Speed
The total distance traveled divided by the
total time taken.
http://www.fotopedia.com/items/flickr-3806892027
15. Fun Fact
Photographers can take time lapse photos to
show motion over time. If the
photographer knows the time between
shots, he or she can find the average speed
between any two positions.
16. Stop. . Time For a Mini Lab
1. Choose two points, such as two doorways,
and mark each with a small piece of tape.
2. Measure the distance between the two
points.
3. Use a timer to time yourself walking from
one point to the other.
4. Time yourself walking slowly, walking
safely and quickly and walking a varying
speed (slow/fast/slow)
17. Analysis of Mini Lab
1. Calculate the average speed in each case.
2. Predict how long it would take you to
walk 100 meters slowly, at your normal
speed and quickly.
18. Integrating Life Science
Different animals can move at different top
speeds. What are some of the fastest
animals? Research the characteristics that
help animals run, swim or fly at high
speeds!
19. Reference Slide
McCarthy PhD, Thomas; Lillie, Deborah; Zike, Dinah; Zorn, Margaret. Glencoe
Science:Motion, Forces, and Energy. The McGraw Hill Companies, 2008.
Print
