Vertical Bounce Worksheet

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Vertical Drop & Bounce Easing Practice worksheet I

In this worksheet you will explore how to use easing to simulate the accelerating effects of gravity on an object.

[Easing knowledgebase]

	How to Position Tween
	How to ease in
	How to ease out
	How to change frame rate
	Calculating Velocity
	Calculating Acceleration

Exercise I "Simple Gravity Bounce"

[Click here to download

the .fla file]

Step I	Create a new document 100x600 pixels. Draw an object, then make it into a symbol.


Step II	Position the object on the top of the stage using the align tool.

Step III	Create new keyframe in frame 10 and position the object at the bottom of the stage using the align tool.

Step IV	Create a new keyframe in frame 20 and position the object to the far right of the stage using the align tool.


Step V	Right click on any frame between frame 1 and 10 and select "Create Motion Tween".Then in the "Properties" panel and change the "Ease" setting to -100% (ease in)


Step VI	Right click on any frame between frame 10 and 20 and select "Create Motion Tween".Then in the "Properties" panel and change the "Ease" setting to 100% (ease out)


Note: The slight pause at the end of each complete oscillation. This due to the looping effect. There are two successive frames where the object is in the same position creating a pause. (Click here to see how to fix this)

Easing Curve

In this bouncing animation there is no deformation of the ball and there is no energy loss. The acceleration is uniform and considered to be an approximation of acceleration due to gravity (9.82m/s/s).

Gravity accelerates the object toward the ground before the bounce AND accelerates the object toward the ground after the bounce creating the effect of deceleration AWAY from the ground.