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Project: a ball's path

Place a dot at (x, 150 - x * x / 150) for x from -150 to 150 in steps of 10, cycling through at least 3 colours.

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A thrown ball follows a curve called a parabola: height = 150 - x² / 150 is one. Plot it by looping x from -150 to 150 in steps of 10, working out y, moving the pen there without drawing (penup) and placing a dot. Dots in several colours show the path like a flight trail.

Your task

Place a dot at (x, 150 - x * x / 150) for x from -150 to 150 in steps of 10, cycling through at least 3 colours.

Stretch challenge

Draw a second, wider arc in another colour.

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Project: the bouncing ball

Move the ball 20 steps. If x goes above 100, set x to 200 - x and reverse the speed; if x goes below 0, set x to -x and reverse the speed. Count the bounces. Print the final x, then the number of bounces.

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Project: free fall

Drop from a height of 80 metres. Print the height after each whole second while it is above ground, like After 0 s: 80 m, then Landed after 4 s.

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Project: a ball's path: common questions

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