Event block: when green flag clicked

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Date:

Class:

Quick Questions

Shade in the A or B circle for each question.

1. Which block is used to start a script when you click the green flag?

A forever

B when green flag clicked

2. Where does the 'when green flag clicked' block go in a script?

A At the bottom of the stack

B At the top of the stack

3. True or false: The blocks stacked under 'when green flag clicked' run when you click the green flag.

A True

B False

4. What happens to a stack of blocks that has NO event block at the top?

A It does not start when the green flag is clicked

B It starts by itself when the green flag is clicked

5. Why is 'when green flag clicked' called a hat block?

A It has a rounded top and sits on top of a script like a hat

B It makes the sprite wear a hat

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1when green flag clicked		Awhen green flag clicked say Hello! for 2 seconds move 10 steps
2hat block		BThe move block is not joined to the hat block. A block that is not stacked under the event block will not run when the green flag is clicked.
3To start a program when the green flag is clicked, put the event block at the top of the script, with the other blocks stacked underneath		CA block with a rounded top that sits at the very top of a script and starts it
4Two separate scripts can both start at the same time when the green flag is clicked		Dwhen green flag clicked move 10 steps when green flag clicked say Hi!
5move 10 steps say Hello! when green flag clicked		EThe event block is at the bottom. A hat block must be at the top of the script, or the blocks above it will not start when the flag is clicked.
6when green flag clicked move 10 steps (separate stack)		FAn event block that starts the script stacked under it when the green flag is clicked

Definitions

when green flag clicked

Fill in the Blanks

Complete each line of code by filling in the missing parts.

_______________________ say [Hello!] for (2) seconds

when __________ clicked say [Let's start!] for (2) seconds

when green flag clicked ____ (10) steps

when green flag clicked say [Go!] for (2) seconds ____ (15) degrees

when green flag clicked _____ [Ready?] for (2) seconds

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A when green flag clicked

B say [Ready!] for 2 seconds

C move (10) degrees

D turn right (15) degrees

Question 2

A when space key pressed

B set [score v] to (0)

C say [Go!] for 2 seconds

Question 3

A when green flag clicked

B go to x: 0 y: 0

C say [Hi!] for 2 seconds

D when green flag clicked

Question 4

A when green flag clicked

B say [Hello!] for 2 seconds

C move (10) steps

D say [Bye!] for seconds

Question 5

A when green flag clicked

B set [score v] to (0)

C change [score v] to (1)

D say (score) for 2 seconds

Answer Key

Event block: when green flag clicked

Section A: Quick Questions

B — when green flag clicked

B — At the top of the stack

A — True

A — It does not start when the green flag is clicked

A — It has a rounded top and sits on top of a script like a hat

Section B: Match the Pairs

when green flag clicked → An event block that starts the script stacked under it when the green flag is clicked

hat block → A block with a rounded top that sits at the very top of a script and starts it

To start a program when the green flag is clicked, put the event block at the top of the script, with the other blocks stacked underneath → when green flag clicked say Hello! for 2 seconds move 10 steps

Two separate scripts can both start at the same time when the green flag is clicked → when green flag clicked move 10 steps when green flag clicked say Hi!

move 10 steps say Hello! when green flag clicked → The event block is at the bottom. A hat block must be at the top of the script, or the blocks above it will not start when the flag is clicked.

when green flag clicked move 10 steps (separate stack) → The move block is not joined to the hat block. A block that is not stacked under the event block will not run when the green flag is clicked.

Section C: Definitions

when green flag clicked — An event block that starts the script stacked under it. It is a hat block that sits at the top, and the program begins when you click the green flag.

Section D: Fill in the Blanks

when green flag clicked
say [Hello!] for (2) seconds

when green flag clicked
say [Let's start!] for (2) seconds

when green flag clicked
move (10) steps

when green flag clicked
say [Go!] for (2) seconds
turn (15) degrees

when green flag clicked
think [Ready?] for (2) seconds

Section E: Spot the Error

C — The move block counts in steps, not degrees. Degrees belong to the turn block. The line should be 'move (10) steps'.

A — This script should start when the green flag is clicked. 'when space key pressed' is a different event block, so clicking the green flag would not run the script. Line 1 should be 'when green flag clicked'.

D — A hat block such as 'when green flag clicked' must sit at the top of a script. It cannot go at the bottom. This line should be 'turn right (15) degrees'.

D — The 'say for' block needs a number of seconds. The number is missing. It should be 'say [Bye!] for 2 seconds'.

C — The 'change' block uses 'by' to add to a variable. 'to' belongs to the 'set' block. It should be 'change [score v] by (1)'.