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Red Bull Stratos: Freefall Physics

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In this formative in-class Criterion C task, we connect the content from the last unit with some basics on Forces, using the Red Bull Stratos jump as a basis.

In this formative in-class Criterion C task, we connect the content from the last unit with some basics on Forces, using the Red Bull Stratos jump as a basis.

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• 1. Intro Physics Name: _____________Criterion C: Knowledge and Understanding (Formative) Introduction to ForcesQuestions on this task fit the descriptors below. Level Descriptors 0 The student does not reach a standard described by any of the descriptors below. The student recalls some scientific ideas, concepts and/or processes. 1-2 The student applies scientific understanding to solve simple problems. The student describes scientific ideas, concepts and/or processes. 3-4 The student applies scientific understanding to solve complex problems in familiar situations. The student analyses scientific information by identifying parts, relationships or causes. The student uses scientific ideas, concepts and/or processes correctly to construct scientific explanations. The student applies scientific understanding to solve complex problems including those in unfamiliar situations. 5-6 The student analyses and evaluates scientific information and makes judgments supported by scientific understanding.1. State the names of three at-a-distance forces and three contact forces. (L1-2) At-a-distance Contact2. Identify these situations from the free-body diagrams (FBD’s) (put the letter inside the box): (L1-2) a. Skateboard with rockets b. Skateboard after the rockets have run out c. A helium balloon that is losing its helium d. Rose at the end of Titanic e. MrT’s keys on the desk3. Describe what is meant by the Normal force. (L1-2)
• 2. Intro Physics Name: _____________4. Describe what happens when there is an unbalancednet force acting on an object. (L3-4)Felix took a balloon a long way up into the sky, jumped out, fell for a bit in freefall, lost control a while,recovered, went faster than the speed of sound and then deployed his parachute to land safely. Some quick stats: Jump height: 39,045m Max speed: 1,342.8 km/h Total freefall time: 260s Freefall time to max speed: 40s(Time to Speed of Sound: 34s) Total jump time 9min 9s Felix’s mass with all the gear: 118kgSources: http://www.redbullstratos.com/blog/post/337395610195. Mass is a measure of the quantity of matter in an object (kg). Weight is a measure of the force of that object being pulled to Earth. On Earth, objects have a weight of 10N per kg. Determine Felix’s weight with all the gear. (L1-2) ___________ N6. Calculate Felix’s average downward velocity in m/s over the whole jump. (L3-4)7. Calculate the average accelerationfrom standing on the platform to maximum speed (m/s/s): (L3-4)8. Suggest reasons why Felix’s average acceleration was slightly less than 9.8m/s/s. (L3-4)
• 3. Intro Physics Name: _____________9. Drawand labelfree body diagrams (FBD’s) for these situations.Note: Air resistance is a function of velocity – so the faster an object moves, the greater the air resistance itgenerates. A small, fast object can generate as much air resistance as a large, slow parachute.This animation might help: http://www.mrwaynesclass.com/teacher/projectile/terminal/home.htmlAnd this: http://www.physicsclassroom.com/mmedia/newtlaws/sd.cfm (L3-4) a. The capsule on the ascent. b. Felix before stepping off the platform c. Felix as he accelerates in freefall Notes: d. Felix at terminal velocity in freefall Gravity is constant e. Felix and his parachute just after the parachute is opened FBDs are vector diagrams f. Felix and the parachute at the new, slower, terminal velocity10. Two of the FBD’s above should look exactly the same. Identify them and explain your choice. (L5-6)
• 4. Intro Physics Name: _____________11. Use information in the graph below (and your own reasoning) to suggest why Felix had to jumpfrom so high in the atmosphere in order to break the speed of sound. (L5-6) Adapted from: http://en.wikipedia.org/wiki/Atmosphere_of_Earth12. Evaluate the claim that the Red Bull Stratos was a jump “from the edge of space.” (L5-6)