Sow and Grow
What do they have in common?
Mini-lesson Exploring the speed of change
Vocabulary Match or define keywords in your workbook
● ● ● ●
Change Speed Grow Melt
● ● ● ●
Imperceptible Erosion Dissolve Perceptible
Let’s Discuss 1. Which of these changes are visible? A. A rock being eroded B. A hole forming in your jeans C. An ice-cream melting on a hot day
1. Which of these changes are not visible? A. A rock being eroded B. An ice-cream melting on a hot day C. A sandcastle being washed away by the ocean
In your workbooks or with a partner, record, discuss, or share a deďŹ nition of change and examples of fast (visible) change and slow (imperceptible) change.
Worked Example Step 1. Drag the Time Trigger block, Interval Block and Camera block onto the Workspace.
Step 2. Set the Time Trigger block to a few minutes from now and the Interval block at 10 second intervals.
Worked Example Step 3. Connect the output of the Interval block to the input of the Camera block.
Step 4. Point the camera at the desk. You should have a piece of paper ready.
Worked Example Step 5. Start the system and begin to draw or write.
Step 6. After one minute stop and check the photos in your device.
Checks for understanding
1. How have we recorded change on the paper? A. We drew on it. B. We took a photo C. We took a series of photos which record the change step by step
Challenge 1
Step 1. Setup the system as before.
Step 2. Place a glass with some water in front of the camera.
Challenge 1 Step 3. Set the Interval block to trigger every 20 seconds
Step 4. Put a small amount of sugar in the water and start the system
Step 5. After 3 minutes look at the pictures
Checks for understanding 1. Why can we not see the sugar dissolve before our eyes? A. Because they are very small B. Because the change happens too gradually C. Because it is diďŹƒcult to see
2. Why can we see how the sugar dissolved when we look at the photos? A. Because the photos shows a slow change all at once B. Because the camera can see better than our eyes C. Because the computers makes it easier to see
Challenge 1- Debug it!
The Intervals are too long or too short to capture the sugar dissolving This will depend on: ● the type of sugar ● the temperature if the water ● the amount of sugar Step 1. Edit the Settings of the Time Trigger bock so that they capture the sugar dissolving.
Challenge 2 Step 1 (pre-task). Make an environment for cress seeds to grow: ● Get a yoghurt pot ● Put wet kitchen roll in the bottom and damp cotton wool on top ● Place cress seeds on top and put near a window to grow Step 2. Make sure you have completed Step 1 and have a yoghurt pot with cress seeds in it, ready to grow.
Challenge 2 Step 3. Add 7 time trigger blocks to the workspace.
Step 4. Edit the settings of all the Time Trigger blocks to the same time but a dierent day on each.
Challenge 2
Step 5. Connect the outputs of the Time Trigger blocks to the input of a Camera block.
Step 6. Leave the system for 7 days.
Challenge 2
Step 7. After 7 days you’ll see the cress has grow.
Step 8. Make a slideshow of your photos and show them to the rest of the class.
Checks for understanding
1. How does the system help us see a slow change? A. It makes the cress grow B. It makes a movie C. It takes a series of photos at dierent stages of the change which we can then look at, all at once
Tidy Up/Exit Ticket ✓ Today I learned….