Gracja Kowalska kl. 2 IB

BOUNCING BALLS

Research question:

What is the relation between the height from which the ball falls and the time in which the ball bounces? How is the time dependent on the height?

Variables:

Apparatus:

  • 2 table tennis balls of different mass
  • stopwatch [±0.05 s]
  • measuring tape [±0.05 cm]
  • 2 different surfaces

Sketch: The way experiment was carried

Method:

  1. 7 different heights (45-130 cm) were established using measuring ruler
  2. 2 balls of different mass were picked
  3. starting with the lowest height. the ball was let freely
  4. the time during which ball bounced 6 times was measured and recorded using stopwatch
  5. the experiment was repeated 3 times for each height
  6. the same experiment was carried out with another ball

DCP:

I divided this experiment into 2 phases: the first one, original, was using floor as the surface on which the experiment was carried. The second phase was invented to reduce the uncertainties and make the experiment more reliable, precise and accurate.

For the first phase of the experiment. I chose floor as the surface on which the ball was bouncing and the measurements were recorded.

Join now!

rounded to 2 decimal place

The mean was calculated for each height and each ball.

mean=

rounded to 2 decimal place

To make the experiment more accurate and have more datas to compare, I designed the second phase of the experiment. The method used was the same, but the surface-on which the experiment was carried out- was changed from floor to table. Measurements were recorded as below:

rounded to 2 decimal place

Again, the mean was calculated using given equation.

mean=

rounded to 2 decimal place

Having all measurements done. I decided ...

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