Acceleration Inquiry LabAcceleration Inquiry LabPart 1: Experimental Set Part 1: Experimental Set

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2/4/112/4/11

CurriculumCurriculum

Big Idea:Big Idea: Objects that move in translational Objects that move in translational motion are described in terms of position, motion are described in terms of position, velocity, and acceleration.velocity, and acceleration.

Essential Question:Essential Question: How can the motion of How can the motion of an object be described in a measurable an object be described in a measurable and quantitative way? and quantitative way?

Concept:Concept: The position, velocity, and The position, velocity, and acceleration of an object can be measured acceleration of an object can be measured and quantified (in magnitude and and quantified (in magnitude and direction), using appropriate tools and direction), using appropriate tools and units, in a reference frame. units, in a reference frame.

Today’s AgendaToday’s Agenda

Opener:Opener: What is the difference between speed and What is the difference between speed and velocity?velocity?

Speed vs. Velocity Speed vs. Velocity DemonstrationDemonstration Review:Review: Discussion and Notes on acceleration Discussion and Notes on acceleration Acceleration Inquiry Part 1Acceleration Inquiry Part 1: Given 1 ramp, 1 ball, 1 : Given 1 ramp, 1 ball, 1

meter stick, and 1 stop watch, come up with a meter stick, and 1 stop watch, come up with a scientific question, and scientific question, and design an experimentdesign an experiment. You . You will conduct this experiment on Monday.will conduct this experiment on Monday.Academic – See handout.Academic – See handout.

IPS KickoffIPS Kickoff – Work in project groups. – Work in project groups. Closure:Closure: Solve an acceleration problem. Solve an acceleration problem.Assignment (Assignment (HonorsHonors): page 25 #1-14): page 25 #1-14Assignment (Assignment (AcademicAcademic): Read pages 13-16): Read pages 13-16

What is Acceleration?What is Acceleration?

speeding up, slowing down, or speeding up, slowing down, or changing directionchanging direction

rate at which velocity changesrate at which velocity changes acceleration = acceleration = ΔVelocityΔVelocity

timetime

How do we find a change in How do we find a change in velocity?velocity?

ΔVelocity = final velocity – initial ΔVelocity = final velocity – initial velocityvelocity

ΔVelocity = Vf – ViΔVelocity = Vf – Vi a = a = Vf – ViVf – Vi

tt

What is Velocity?What is Velocity?

speed with directionspeed with direction Speed versus Velocity Speed versus Velocity

Demonstration: Take Notes!Demonstration: Take Notes!

Example Calculation Example Calculation

A car speeds up from 0 mi/h to 10 mi/h in 3 A car speeds up from 0 mi/h to 10 mi/h in 3 seconds, and from 10 mi/h to 20 mi/h in the seconds, and from 10 mi/h to 20 mi/h in the next 3 seconds. The car is traveling on a next 3 seconds. The car is traveling on a straight highway. What is the car’s velocity?straight highway. What is the car’s velocity?

a = a = Vf – ViVf – Vi tt

a = a = 10mi/h – 0mi/h10mi/h – 0mi/h 3 s3 s a = a = 10mi/h10mi/h 3s3s a = 3.3 mi/h/sa = 3.3 mi/h/s

units for acceleration units for acceleration

mi/h/s, m/s/s, m/smi/h/s, m/s/s, m/s22, km/h/min, km/h/min

Statement of problemStatement of problem

(4 points)(4 points)

- Not a Yes/No Question- Not a Yes/No Question

- independent and dependent - independent and dependent variables includedvariables included

- problem is clearly testable- problem is clearly testable

- response in written in a clear and - response in written in a clear and concise mannerconcise manner

Hypothesis Hypothesis (4 points)(4 points)

- statement predicts a relationship or - statement predicts a relationship or trendtrend

- statement gives specific direction to - statement gives specific direction to the prediction(s): a stand is taken.the prediction(s): a stand is taken.

- prediction includes both independent - prediction includes both independent and dependent variablesand dependent variables

- a rationale is given for the hypothesis- a rationale is given for the hypothesis

MaterialsMaterials (3 points) (3 points)

- all materials listed- all materials listed

- no extra materials- no extra materials

- separate from procedure- separate from procedure ProcedureProcedure (6 points) (6 points)

- organized- organized

- logical- logical

- repeatable – enough - repeatable – enough

info. (2)info. (2)

- diagram- diagram

- repeated trials- repeated trials

Independent Variable: YOU set these values.Independent Variable: YOU set these values.

Dependant Variable: Changes as a result of the independent variable changing.Dependant Variable: Changes as a result of the independent variable changing.

Closure QuestionClosure Question

A car speeds up as it travels up a straight on-A car speeds up as it travels up a straight on-ramp. Its speed increases from 20 mi/h to 50 ramp. Its speed increases from 20 mi/h to 50 mi/h in 5 seconds.mi/h in 5 seconds.1. What is the car’s change in velocity?1. What is the car’s change in velocity?

- equation- equation- show all work- show all work- answer with UNITS- answer with UNITS

2. What is the car’s acceleration?2. What is the car’s acceleration?- equation- equation- show all work- show all work- answer with UNITS- answer with UNITS