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

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

Date TopicPage

11/8 Measurement 1711/10 Linear Measurement 1811/15 Mass Measurement 1911/17 Volume Measurement 2011/30 Measuring Time 2112/2 Distance, Time, Speed 2212/3 Relationships: Speed 23

Distance, and Time12/8 Problem Solving 2412/9 Lab: 2B Speed 25


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).


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 Lab Manuals - page 8. Remember you are NOT allowed to

write in this book. Any writing goes on the worksheet provided to you.


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.


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.

Hole Average Speed (cm/s)

12 164.354 cm/s

17 200.333 cm/s

18 185.648 cm/s

2 108.206 cm/s

18 205.570 cm/s

18 5,158.2 cm/s

13 481.600 cm/s

13 206.534 cm/s

Science 1/2A

Part 4:

Let’s collect class average data.


1 54.221 cm/s

2

3 58.500 cm/s

15 191.887 cm/s

6 117.987 cm/s

9 137.900 cm/s

12 118.000 cm/s

13 28.481 cm/s


Part 4: Analyze Class Data

– Are the results what you expected?

– Do they support your original hypothesis?

– Answer question 4b on your worksheet.

Science 3/4APart 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?

Variable How 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 1/2APart 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?

Variable How 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


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


Part 7:

Let’s collect class average data now that we have a fair test.


1

2

3

4

5

6

7

8


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.


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

Documents

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