Make sure you have your homework out so Ms. K can stamp it before class starts. 2.2B Speed (green)

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Key Questions 2.1 : Modeling car’s speed

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Make sure you have your homework out so Ms. K can stamp it before class starts. 2.2B Speed (green)

December 9, 2010 Attendance Correct Homework - 2.2B Speed Investigation 2B: Speed Learning Targets: Accurately collect and record data Use data to calculate speed and find averages

Table of Contents DateTopicPage 11/8Measurement17 11/10Linear Measurement18 11/15Mass Measurement19 11/17Volume Measurement20 11/30Measuring Time21 12/2Distance, Time, Speed22 12/3Relationships: Speed23 Distance, and Time 12/8Problem Solving24 12/9Lab: 2B Speed25

Investigation 2B: Speed Let’s review… –What is speed? –What are some units you could use to measure speed? Today you will be using the timer and photogates to measure the speed of a car rolling down a ramp. You will use the unit cm/s (centimeters per second).

Investigation 2B: Speed Before we get started… –What two pieces of information do you need to find the car’s speed? »Distance traveled »Time traveled –What formula will you use? »Speed = distance time

Investigation 2B Which ramp is fastest? Speed

Investigation 2B: Speed  Investigation Lab Manuals - page 8.  Remember you are NOT allowed to write in this book. Any writing goes on the worksheet provided to you.

Investigation 2B: Speed  Part 1: Follow the directions to set up your car and ramp.  Part 2: Read directions in manual, then write your hypothesis and explanation on your worksheet.

Investigation 2B: Speed  Part 3: Read and follow the directions in the manual. Record your data on your worksheet.

Science 3/4A Part 4: Let’s collect class average data. HoleAverage Speed (cm/s) cm/s cm/s cm/s cm/s cm/s 18 5,158.2 cm/s cm/s cm/s

Science 1/2A Part 4: Let’s collect class average data. HoleAverage Speed (cm/s) cm/s cm/s cm/s cm/s cm/s cm/s cm/s

Investigation 2B: Speed Part 4: Analyze Class Data – Are the results what you expected? – Do they support your original hypothesis? – Answer question 4b on your worksheet.

Science 3/4A Part 5: There are FIVE major variables, other than ramp angle, that need to be kept the same in order for our experiment to have a fair test. How can we control each one? VariableHow we will control it Distance is the same Photogates are 70 cm Ramp height Hole #16 Top photogate in same spot 10 cm Bottom photogate at same 80 cm Start car Finger on top of screw

Science 1/2A Part 5: There are FIVE major variables, other than ramp angle, that need to be kept the same in order for our experiment to have a fair test. How can we control each one? VariableHow we will control it Location of the top photogate 10 cm Location of bottom photogate 80 cm Distance between photgates 70 cm How car is released Let go by holding on bottom (underneath) Height of bottom of track Hole #10

Investigation 2B: Speed  Part 6: Read and follow the directions in the manual. Be sure to control ALL variables! Record your data on your worksheet.

Investigation 2B: Speed Part 7: Let’s collect class average data now that we have a fair test. HoleAverage Speed (cm/s)

Investigation 2B: Speed Part 7: Analyze Class Data –Was your original hypothesis correct? –Answer question 7b on your worksheet. –The walking speed of an average person is 1 m/s or 100 cm/s. How does your car’s speed compare? –Answer question 7c.

Investigation 2B: Speed  Part 8: Exploring on your own a. Skip b. Work out this problem on your worksheet.

Wrap Up 1.Summary – What did you learn in science today? 2.Flipper: –2B Speed