HOW DO WE MEASURE AND DESCRIBE MOTION?

A FALLING FLOWER

PROCEDURE

• I will put a meter stick up against a wall, as a reference point.
• I will drop the flower from one meter height, and time how long it takes to reach the ground.
• I will repeat the procedure three times, for the best average.

How do you calculate?

Average your times, by adding them up and dividing by how many times you have!

Distance (three trials)

1m
1m
1m
Avg= 1m

Time (three trials)

.59s
.48s
.54s
Avg= .53s

Speed

1m divided by .53s equals
1.88 m/s
Which is about 2 m/s

Now how about water through a hose?

Procedure

• I figure out length of hose (8m)
• I start the video as i turn on the hose
• I use the video to see what the time was

Distance

8m
8m
8m
Avg=8m

Time

.5s
.7s
1s
Avg= .7s

Speed

11m/s

HOW FAST WILL YOUR BEANS GROW?

Procedure

• I will take five beans, and put them in a wet paper towel
• Then, i will fold up the paper towel (beans inside), and put that in a plastic baggie
• Each day, i will check and measure all of the beans growth.
• After 6 days, i will average the beans growth.

Lengths

Bean 1: 5.6cm
Bean 2: 7cm
Bean 3: 5.3cm
Bean 4: 5.4cm
Bean 5: 3.7cm

Time

Six days (for all beans)

Speeds

Bean 1: .93 cm/d (about .9 cm/day)
Bean 2:1.1 cm/day
Bean 3: .88cm/day (about .9cm/day)
Bean 4: .88 cm/day about .9cm/day
Bean 5: .6cm/day

FASTEST BEAN(S) final results
1st place: bean 2 (1.1cm/d)
2nd place: bean 1 (.93cm/d)
3rd place: beans 3 and 4 (.88cm/d)
4th place: bean 5 (.6cm/d)