1 / 16

Task Will involve the energy transfers involved when a

Task Will involve the energy transfers involved when a table tennis ball is dropped vertically and allowed to bounce on a horizontal surface. Equipment provided for taking measurements. Metre rule for measuring heights-uncertainty. Set-square-to set in vertical position. Task

kashcraft
Download Presentation

Task Will involve the energy transfers involved when a

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Task Will involve the energy transfers involved when a table tennis ball is dropped vertically and allowed to bounce on a horizontal surface Equipment provided for taking measurements Metre rule for measuring heights-uncertainty Set-square-to set in vertical position

  2. Task Will involve the energy transfers involved when a table tennis ball is dropped vertically and allowed to bounce on a horizontal surface Height (dropped from),h Height of rebound,s

  3. Table and graph Words or abbreviations height/centimetre or h/cm at top of column Height (dropped from) Height of rebound

  4. Results Range of values to be between 100 and 10cm (this includes the rebound heights) This implies- preliminary tests to check rebound height Lowest height requires a rebound height above 10cm Maximum height of 100cm – could be less sensible intervals chosen Minimum number of readings- to see a trend

  5. Repeats Repeats Repeats Repeats Repeats Rebound height should be measured at least 3 times for each height.

  6. Readings presented appropriately Sig Fig 70.0cm 700mm 0.700m for drop height Rebound height is more difficult:- Either nearest mm or nearest cm would be accepted

  7. Calculating means should also be included in your results table

  8. Graph s/cm 0 h/cm

  9. Line graph analysis Proportional - straight line through the origin Linear - a straight line (not through origin)

  10. uncertainty in huncertainty in s(rebound) • h will be + or – 1mm • Uncertainty in an averaged result will be ½ x range of repeat values

  11. Use of set square-checking for vertical

  12. Use of set square- measuring diameter of ball A B Uncertainty in A = + or – 1mm Uncertainty in B = + or – 1mm 2 uncertainties for a distance added together uncertainty in diameter =+ or – 2mm (or more)

  13. Change in gpe height - diameter Measured height Gpe = w x h uncertainty will be Uncert in w + uncert in h Uncertainty will be:- Uncertainty in w + uncertainty in h

  14. Tricks with gradients Well drawn straight line Lines can be extended If necessary Smooth curve

  15. Gradient rules Large triangle for linear part of graph (extend line if necessary) Correct readings taken Gradient calculation:- 2 or 3 sig. fig Correct unit must be stated

  16. Does temperature affect the bounce using a • Larger ball? • How to measure temperature • Number of temperatures (8,9 or 10) • How to release the ball • Control variable -----height • Quick transfer from water reduces heat loss • Use tongs for hot temperatures to avoid burns • Better way to measure rebound height • (still frame analysis from video) • Repeat readings (reheating ball each time)

More Related