PULLEYS

Go to this website to help you fill in the worksheet. 
http://scienceforkids.kidipede.com/physics/machines/pulley.htm


Learn about simple and compound machines while you explore the House and Tool Shed! 

http://www.edheads.org/activities/simple-machines/index.shtml



This video shows us how pulleys are used at NASA with the Space Shuttle. 
http://www.neok12.com/video/Simple-Machines/zX56004f445662567a447c45.htm

TUESDAY grammar

click here for NOUNS and VERBS

click here for THEY THEIR THEY"RE


click here for more NOUNS and VERBS




http://kids.nationalgeographic.com/kids/   do some exploring.

Tuesday MARCH 25th LITERACY practise

Hey there, Grade 4! 
 "Conventions" is one of the writing traits.  It involves knowing where to put the periods, commas, apostrophes, question marks, etc.  This game will help you practice!  

1. Click here  FOR PUNCTUATION

Here are more games to help you improve your literacy. 

2. Click here for NOUNS, ADJECTIVES ETC. 
3. Click here for SUFFIXES and PREFIXES


4. Click here for more practice with "How to" writing. 

SOUND - Doppler Effect

The Doppler effect can be observed for any type of wave - water wave, sound wave, light wave, etc. 

We are most familiar with the Doppler effect because of our experiences with sound waves. 

Think about a police car or emergency vehicle was traveling towards you on the highway. As the car approached with its siren blasting, the pitch of the siren sound (a measure of the siren's frequency) was high; and then suddenly after the car passed by, the pitch of the siren sound was low. That was the Doppler effect - an apparent shift in frequency for a sound wave produced by a moving source.

The siren keeps on making the same sound all the time but YOU hear a different pitch (high pitch then a low pitch) as the siren moves past you.  

Look at the picture to help you understand why this happens.  Do you see how the wavelengths are different depending where you are standing?  

Reading Comprehension Activities

Practice inferring - please do all three exercises. 


1. Lesson One:  
http://www.studyzone.org/testprep/ela4/o/makinginferencel.cfm

2. Lesson Two: 
http://www.studyzone.org/testprep/ela4/h/inferchar.cfm

3. Lesson Three: 
http://www.studyzone.org/testprep/ela4/o/inferencep.cfm









This website will help you practice many different reading comprehension strategies, such as visualizing, summarizing, and inferring.  

Start with the 'MAGNIFYING GLASS' icon which will take you to the INFERRING practice page. 

Click here to log in.  REMEMBER to write down your account name for next time. 

How loud is TOO loud?

Play this game to learn about which sounds are dangerous to your hearing.

click here

Sound Definitions

Fill in the blanks on your sheet. 

Sound definitions:

Decibels (dB) -  a measure of how much energy a sound carries 

[how strong it is].  A conversation is 60 dB, 

a noisy restaurant is 70 dB and a rock concert is 120 dB.

Infrasound - a sound below what humans can hear.  

Scientists have discovered that elephants communicate using low sounds 

that humans can’t hear.  Their low rumblings produce very long sound 

waves that travel far across forests and grasslands.

Ultrasound - a sound above what humans can hear.  

These very high sounds are used by bats, porpoises and some kinds of 

insects to communicate.