Transcript Day 7 Pd. 3 & 8 Velocity & Acceleration

Student Objective
• Based on data collected, graph and
calculate average speed using distance and
time.
WARM-UP
Tell me about the motion of the object for
each part of the graph.
*See next slide
Speed Graph
A
B
Steady,
fast,
away
C
Stead,
medium,
away
Speeding
up, away
D
Stopped
E
Time
Steady,
medium,
closer
Circle the graph that best matches each scenario below.
1. Jeffery left his home headed toward
the school. He started out at a steady
moderate pace until he got to a red
light. While stopped at the light, he
realized that he had forgotten his
math homework. He turned around
and headed back home at a faster
pace. Then he drove to school at a
fast pace without stopping on the way.
2. The post office charges $.41 for
any mail up to an ounce in weight.
After that the charge is $.23 for
each additional ounce or part of an
ounce. For instance, if it weights 1.1
ounces or 1.9 ounces, it will cost the
same, $.64.
3. The price of a certain CD varied over
a period of time. It started high and
remained the same for a period of time.
Then it had a steady decrease until it
reached an all time low, where it stayed
the same for a period of time. In the
end, the stock rose fast to a moderate
price, where it remained for the
remaining time.
Which distance-time graph represents each car?
How would you describe
the motion of these cars?
Are they accelerating, decelerating,
or moving at a constant speed?
- Describing and Measuring Motion
Calculating Speed
• If you know the distance an object travels in a
certain amount of time, you can calculate the
speed of the object. Speed = distance ÷ time
Calculate the speed of each animal after one minute (60 sec.) has elapsed.
Rabbit
Speed = D/T
Speed = 1000m / 60sec
Tortoise
Speed = D/T
Speed = ______m
/ 60sec
4
Cheetah
16.67 m/s
Speed is _______
0.07 m/s
Speed is _______
Speed = D/T
2000
60
Speed = ______m
/ ____sec
33.33 m/s
Speed is _______
Conclusion: Which
animal is the has the
fastest speed?
Animal
A. 10 miles in 2 hours
B. 50 miles in 25 hours
C. 15 miles in 5 hours