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[sPH-tLI] 1'r.l'irtual Lab: Centripetal Force Investigation Curriculum Expectations: 82.? conduct inquiries into the uniform circular motion ofan object {e_g. using video analysis of an amusement park ride, measuring the forces and period of a tether ball], and analyse, in qualitative and quantitative terms, the relationships between centripetal acceleration, centripetal force, radius of orbit, period, frequency, mass, and speed [ PRAI J Walkthrough Video 8r. Experiment: Please check the attached video. Learning Objectives: - To verify the relationship between centripetal force and variables such mass, speed. radius, frequencv, and period in uniform circular motion Background Information: You have learned about the principles related to objects in uniform circular motion. In this investigation, you will use a simulation program to verify,r the relationship between centripetal force and variables such as mass, speed, radius, frequency. and period for a mass attached to a rope swinging in a circle with uniform circular motion. Lab write'up 8r. Evaluation [SPH4U] Please refer to the lab report template in course documents. A before and after diagram detailing the experiment along with a conclusion will be submitted to show your thought process. Please complete all the sections of the lab report template when filling out your observations. Procedure: The demonstrator in the lab video will perform this procedure. 1. Go to the Nelson Science website and start the simulation. 2. Display the vectors for force, acceleration, and velocity in your simulation. Determine net force (centripetal force) for different values of the radius, keeping mass and speed constant. Record all information in the table and use at least five different values for the radius. 3. Graph the centripetal force versus the radius and the centripetal force versus 1/radius separately. 4. Repeat Steps 1 and 2, but change the mass and keep the speed and radius constant. Graph the centripetal force versus the mass 5. Repeat Steps 1 and 2, but change the speed and keep the radius and mass constant. Graph the centripetal force versus the speed and the centripetal force versus the square of the speed. 6. Determine the period and frequency for each speed used in Step 5, and record the results in your table. Observations & Calculations: When radius increases When mass increases Centripetal ForceData Analysis: A ball is attached to a string that is 1.5m long. It is spun so that it completes two full rotations every second. What is the centripetal acceleration felt by the ball? Define Centripetal force. Virtual Lab 1 Rubric Level 1 Level 2 Level 3 Level 4 Marks (50-59%) (60 - 69%) (70 - 79%) (80 - 99%) Knowledge and Understanding Organization of lab Report Lab has limited Lab is somewhat Lab is well Lab is ( 12) organization organized organized thoroughly organized Title, name, partner name Well ordered Use of subheadings Neatness Includes all lab component[SPH4U] Purpose/Question Limited Some Considerable Thorough ( 12) explanation explanation explanation explanation Hypothesis Use of "if, then, Use of "if, then, Use of "if, then, Use of "if, because" because" because then, statement no statement with statement with because" justification some justification statement ( 12) justification with connection to scientific theory Experimental Design / Design with no Design with Considerable Thorough Materials variables but with some design, correct design, list of materials. identification of identification of correct variables and/or variables, identification (14) incomplete list of complete list of of all relevant relevant variables, materials materials complete list of relevant materials Application Procedure Procedure was Procedure was Procedure was Procedure 0 Numbered steps, written with many written with well written was including any changes errors. some errors. with few errors. thoroughly ( 15) made to the procedure. written with no Passive past-tense errors. No pronouns (I, we, us, you, etc.) Observations Observation table is Observation table is Observation table is Observation table is Use of chart, including incomplete and lacks somewhat complete complete with few thorough and labels, easy to read detail. and/or somewhat errors. detailed with no Qualitative: detailed. errors. 0 Detailed (e.g. before, (15) during, after) Scientific language (e.g. colour, state of matter) Quantitative: 0 Units Symbols 0 Round to 2 decimal places No calculations[SPH4U] hinking-Inquiry Skills Calculations Some calculations Calculations are Calculations Calculations madebut are somewhat with no are thoroughly incorrect. complete with significant complete with Formulas some errors. errors. no errors. ( 15) Units Symbols Show all work Analysis Analysis is missing Analysis includes Analysis includes Analysis is manycomponents somecomponents all components thorough, clear and/or lack and/or missing but justifications and concise Answer the assigned justifications. some lack clarity. questions using full justifications. sentences (restate the questions in answer). Use observations to justify ( 15) answers. (3 part answer) Answers connect theory learned to lab experience. Graphs have title, labels, scales, etc. No pronouns Communication Conclusion Conclusion Conclusion Conclusion is Conclusion is (supports/rejects (supports/rejects well written (and thoroughly hypothesis) with hypothesis) with supports/rejects written (and limited some explanation. hypothesis) with support/reject explanation. a good hypothesis )with explanation. supporting details that ( 15) connect theory to observations