Light and Shadows Teacher Slide

Light and Shadows

ScientiďŹ c Investigation What time of day is it in dierent cities of the world?

Mini-lesson How do light and shadow aect our everyday lives?

Keywords Match or define keywords in your workbook ● ● ● ● ● ●

Shadow Light Solar power Opaque Clear Pollution

Let’s Discuss 1. How do shadows appear?

A. A shadow appears because it’s dark outside B. A shadow appears because and object is between light and a surface C. A shadow appears because it’s daytime

2. In your workbook or with a partner, record, discuss, or share the relationship between the sun’s movement and shadows.

Worked Example Step 1. Turn on and pair: â—? 1 RGB LED

Step 2. Drag the RGB LED block onto the Workspace

Step 3. Add a Key Press block and a Toggle block to the Workspace.

Place the Toggle between the Key Press and RGB LED.

Challenge 1 Step 1. Using the system created, add a Cycle Brightness block to the Workspace

Step 2. Add the Cycle Brightness between the Toggle and the RGB LED

Challenge 1 Step 3. Place the ping-pong ball in the middle of the table.

Place the RGB LED above the ball, slightly to the right.

Step 4. Change the brightness of the RGB LED.

Checks for understanding 1. Does the brightness of the light aect the shadow created?

A. Yes B. No C. Sometimes

2. Does the position of the light aect the shadow created?

A. Yes B. No C. Sometimes

Challenge 1- Debug it!

Step 1. Draw a line around the shadow

Step 2. Try placing the RGB LED at dierent distances from the object

Challenge 2 Step 1. Remove the Cycle Brightness block from the system and replace with the RGB Cycle Colors block Step 2. Place the RGB Cycle Colors is between the Toggle and the RGB LED blocks.

Step 3. Press the Key Space to change the color of the RGB LED from red, green to blue.

Challenge 2 Step 4. Place the ping-pong ball in the middle of the table. Place the RGB LED above the ball, slightly to the right.

Step 5. Photograph your results! Add the Camera block between the Key Press and the RGB LED.

Checks for understanding 1. What makes a shadow move and change shape?

A. The Light sensor B. The RGB LED C. The RGB LED, Threshold and Inverse functions

1. Based on our experiment, why do you think yellow is the common color for lights?

A. The Light Sensor and RGB LED B. The DC Motors C. The Light Sensor, Threshold and Inverse functions

Tidy Up/Exit Ticket ✓ Today I learned….