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From Macro to Nano: Scaling and Units

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  1. From Macro to Nano: Scaling and Units Team members: Jenny Douglas Gloria Oporto Aradhya Kumar Facilitator Mike Hanna

  2. Target Audience • Students in any introductory science course or lab

  3. From Macro to Nano: Scaling and Units Students will be able to: • Communicate clearly with consistent units that are appropriate to the context. • Apply order of magnitude and unit conversion to accurately solve problems and compare results with scientific peers. • Understand conversion of units and explain the consequences of incompatible units.

  4. $125 Million dollar question How could you lose $125M in one minute? 1. You put $125M on “red” on the roulette wheel in Los Vegas. 2. You lose the vacuum in the large hadron collider in Geneva. 3. You discover the human genome DNA sequence was heavily contaminated. 4. You lose a Mars Orbiter en route to the planet. 5. You lose all the primates in the NIH primary facility when PETA breaks in.

  5. Mars Orbiter Video Mars Climate Orbiter - YouTube

  6. Speed 1 Intended orbit: 150 km altitude Speed 2

  7. Team 1: Design the software Units: English (lb, in, ft) Team 2: Provide the information Units: Metric (SI) (km, m, g)

  8. Example of units and its conversion Units of force * The value of gn as used in the official definition of the kilogram-force is used here for all gravitational units.

  9. Activity We are going at 60 miles/h, what would be the equivalent in m/s? • What do you know? • What do you need to know? • Solve the problem

  10. Activity – follow upScaling - Surface area determination X Y a b b Determine the surface area of shapes X and Y Group 1: a=5 cm, b=1 cm Group 2: a=2 in, b=0.4 in

  11. Activity – follow upPhysics – Unit conversion Determine the acceleration due to gravity given the length in cm.