MEASURING MOTION

PEBBLE DROP

• First, I filled a glass of water with .10 meters of water.
• I dropped the pebble in the water and at the same time I started the timer.
• I stopped the timer when the pebble hit the bottom of the glass and repeated these steps for two more trials.

pebble drop data
•to calculate the speed of the pebble, I divided the distance (depth) of the water by the time it took for the pebble to hit the bottom

RISING WATER IN BATHTUB

• I taped a ruler to the side of my bathtub.
• I turned on the water and timed how long it took the water to reach .10 m, .20 m, and .30 m.

rising water in bathtub data
•to calculate the speed at which the water was rising I divided the distance (depth) of the water in the bathtub by the total number of seconds it took to get to that depth.

POINT ON THE RIM OF A BICYCLE WHEEL

• First, I measured the circumference of the wheel.
• Then, I picked a point on the wheel (valve stem).
• I then spun the wheel and timed how long it took for the valve stem to reach the same point that it started at.
• I repeated the same steps for two more trials.

point on the rim of a bicycle wheel data
•to calculate the speed at which the bicycle rim was moving, I divided the circumference (1-76 m) by the time it took for the valve stem to go go all the way around the wheel