Acceleration Inquiry Lab Part 1: Experimental Set Up 2/4/11

Curriculum Big Idea: Objects that move in translational motion are described in terms of position, velocity, and acceleration. Big Idea: Objects that move in translational motion are described in terms of position, velocity, and acceleration. Essential Question: How can the motion of an object be described in a measurable and quantitative way? Essential Question: How can the motion of an object be described in a measurable and quantitative way? Concept: The position, velocity, and acceleration of an object can be measured and quantified (in magnitude and direction), using appropriate tools and units, in a reference frame. Concept: The position, velocity, and acceleration of an object can be measured and quantified (in magnitude and direction), using appropriate tools and units, in a reference frame.

Today’s Agenda Opener: What is the difference between speed and velocity? Opener: What is the difference between speed and velocity? Speed vs. Velocity Demonstration Speed vs. Velocity Demonstration Review: Discussion and Notes on acceleration Review: Discussion and Notes on acceleration Acceleration Inquiry Part 1: Given 1 ramp, 1 ball, 1 meter stick, and 1 stop watch, come up with a scientific question, and design an experiment. You will conduct this experiment on Monday. Acceleration Inquiry Part 1: Given 1 ramp, 1 ball, 1 meter stick, and 1 stop watch, come up with a scientific question, and design an experiment. You will conduct this experiment on Monday. Academic – See handout. IPS Kickoff – Work in project groups. IPS Kickoff – Work in project groups. Closure: Solve an acceleration problem. Closure: Solve an acceleration problem. Assignment (Honors): page 25 #1-14 Assignment (Academic): Read pages 13-16

What is Acceleration? speeding up, slowing down, or changing direction speeding up, slowing down, or changing direction rate at which velocity changes rate at which velocity changes acceleration = ΔVelocity acceleration = ΔVelocity time time

How do we find a change in velocity? ΔVelocity = final velocity – initial velocity ΔVelocity = final velocity – initial velocity ΔVelocity = Vf – Vi ΔVelocity = Vf – Vi a = Vf – Vi a = Vf – Vi t

What is Velocity? speed with direction speed with direction Speed versus Velocity Demonstration: Take Notes! Speed versus Velocity Demonstration: Take Notes!

Example Calculation 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 next 3 seconds. The car is traveling on a straight highway. What is the car’s velocity? 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 next 3 seconds. The car is traveling on a straight highway. What is the car’s velocity? a = Vf – Vi a = Vf – Vi t a = 10mi/h – 0mi/h a = 10mi/h – 0mi/h 3 s 3 s a = 10mi/h a = 10mi/h 3s 3s a = 3.3 mi/h/s a = 3.3 mi/h/s

units for acceleration mi/h/s, m/s/s, m/s 2, km/h/min mi/h/s, m/s/s, m/s 2, km/h/min

Statement of problem Statement of problem (4 points) - Not a Yes/No Question - independent and dependent variables included - problem is clearly testable - response in written in a clear and concise manner Hypothesis (4 points) Hypothesis (4 points) - statement predicts a relationship or trend - statement gives specific direction to the prediction(s): a stand is taken. - prediction includes both independent and dependent variables - a rationale is given for the hypothesis Materials (3 points) Materials (3 points) - all materials listed - no extra materials - separate from procedure Procedure (6 points) Procedure (6 points) - organized - logical - repeatable – enough info. (2) - diagram - repeated trials Independent Variable: YOU set these values. Dependant Variable: Changes as a result of the independent variable changing.

Closure Question A car speeds up as it travels up a straight on- ramp. Its speed increases from 20 mi/h to 50 mi/h in 5 seconds. A car speeds up as it travels up a straight on- ramp. Its speed increases from 20 mi/h to 50 mi/h in 5 seconds. 1. What is the car’s change in velocity? - equation - show all work - answer with UNITS 2. What is the car’s acceleration? - equation - show all work - answer with UNITS