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Unit 2 (Motion & Forces), Day 2 Acceleration

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Agenda Turn in Homework (0 min) Catalyst (5 min) Homework Explanation (5 min) Activity (20 min) Notes (10 min)

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Notes Packet Write your name at the top of the packet DO NOT LOSE Perhaps staple into notebook if necessary Remember, also glue/staple/tape PINK EQUATION SHEET in

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Student Entry Turn in “ Speed & Velocity” Homework! CATALYST: Imagine you are on a bus. Describe how your body moves when: The bus is moving at a constant speed The bus speeds up quickly The bus slows down quickly

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Homework Explanation 11 ft 19 ft 23 ft 31 ft 5 s 9 s 10 s 15 s

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Accelerometer Activity Write your name on the bottom of the index card NAME: Mrs. Larkin

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NAME: Accelerometer Activity Tie string to center point of the accelerometer. Mrs. Larkin

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NAME: Accelerometer Activity Tie a washer to the bottom of the string. Mrs. Larkin

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Accelerometer Activity 10 minutes Stay in courtyard, be efficient One chair per group, push each group member Write observations down (see next slide) Warnings Don’t mess around Don’t push chairs of sidewalk cracks Do not push/stop hard enough to cause a person to fall out

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Accelerometer Activity Observations: Speeding Up Quickly ______________________________________________ ______________________________________________ ______________________________________________ Constant Velocity ______________________________________________ ______________________________________________ ______________________________________________ Slowing Down Quickly ______________________________________________ ______________________________________________ ______________________________________________

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Comparison: Catalyst & Accelerometer THINK Finish your accelerometer activity observations PAIR Compare “Catalyst” responses with “Accelerometer” observations Speeding Up: Body? Washer? Constant Speed: Body? Washer? Slowing Down: Body? Washer? SHARE 3 people called on randomly to respond to questions

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Figuring Out an Equation Acceleration Unit Examples: Meters per second squared Feet per second squared Kilometers per minute squared What do the numerators have in common? __________ What do the denominators have in common? __________

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Acceleration Notes Acceleration Units: meters per second squared

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Acceleration Notes Acceleration (Vector): Rate that velocity is changing Example #1: TimeVelocity 0 s0 m/s 1 s3 m/s 2 s6 m/s 3 s9 m/s First Differences THIS IS ___________________ ACCELERATION ( ______________ __________ )

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Positive Acceleration Diagram When acceleration was positive (speeding up), why did we fall backwards? STARTINGCHANGINGENDING

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Acceleration Notes Example #2 TimeVelocity 0 s7.5 m/s 1 s5.0 m/s 2 s2.5 m/s 3 s0.0 m/s First Differences THIS IS ___________________ ACCELERATION ( ______________ __________ )

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Negative Acceleration Diagram When acceleration was negative (slowing down), why did we fall forwards? STARTINGCHANGINGENDING

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Acceleration Notes Acceleration Equation:

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Acceleration Notes Calculate Acceleration From 0s to 1s From 1s to 3s TimeVelocity 0 s0 m/s 1 s3 m/s 2 s6 m/s 3 s9 m/s

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Acceleration Notes Calculate Acceleration From 0s to 1s From 1s to 3s TimeVelocity 0 s7.5 m/s 1 s5.0 m/s 2 s2.5 m/s 3 s0.0 m/s

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Acceleration Notes Constant Acceleration: Acceleration does not change as time goes on (in other words, first difference between equal time spans should ALWAYS be the same!)

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Practice (EASY) As a school bus slows to a stop, it slows from 9.00 m/s to 0.00 m/s in 5.00 seconds. What is its acceleration? Circle what we are solving for above. Fill out the GIVEN INFORMATION table. VariablesGiven? V0V0 V a t GIVEN INFORMATION

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Practice (EASY MEDIUM) A skateboarder goes from a standstill to a speed of 6.7 m/s in 12 seconds. What is their acceleration? Circle what we are solving for above. Fill out the GIVEN INFORMATION table. VariablesGiven? V0V0 V a t GIVEN INFORMATION

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Practice (EASY MEDIUM) A sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25 seconds. What is their acceleration? Circle what we are solving for above. Fill out the GIVEN INFORMATION table. VariablesGiven? V0V0 V a t GIVEN INFORMATION

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Homework Check PowerSchool for Exam Grade

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