2. LEARNING TARGET: I understand the relationship between distance, time and speed. I can explain the relationship
Mar 19 / Act E 74
Measuring Speed
CH Q
How can you measure the speed of a moving cart?
VOCAB: Next slide

3. Distance
Error
Rate
speed
Time interval
Review: variable(s); evidence
length measurement (beginning to end)
inaccuracy (in measurement)
ratio of one thing compared to another
(given later)
measurement from start to stop

4. DISCUSSION
How did people measure speed before electronic devices were invented?
how many days (or approximate hours) it took by walking / horseback / sailing, etc. a distance
2. What are the components for measuring speed?
Distance and time interval
3. Based on the above answer, can you determine a formula for determining the speed of an object?
Think car when driving, how do you measure that? Miles per hour or MPH
Speed = distance / time

5. DISCUSSION (cont)
Using the formula for speed, what is the speed of a car that travels 100 miles in 2 hours?
Speed = distance / time
100 miles
_________ = 50 miles / hour (MPH)
2 hours

6. PROCEDURE AND DATA
MATERIALS:
PROCEDURE: Read on pg. E 8-10 and summarize
DATA: WS Cart Speed
Pre-lab thought: Why are we doing 3 trials?

7. ANALYSIS
- Discuss and answer Q 2 & 5 on pg. E 10
ANS CH Q
How can you measure the speed of a moving cart? A:
measure time it takes to go a known distance
(vocab) Speed = distance / time
or S = d / t
HOMEWORK
Bring Glue Sticks / scissors