Ease-in ease-out refers to the proximity of the distance traveled by an object between each frame. Ease-in normally refers to when the distance traveled by an object slowly decreases while ease-out is the opposite: it increases. In terms of reality, this is mainly caused by gravity pull, although the cause may vary (Exhaustion, acceleration, deceleration, etc.) In the basic bouncing ball animation, ease-in ease-out occurs when the ball bounces off the ground and due to gravity pull, slows down mid air and decelerates before going back down at an accelerating speed.
2. What does frame-per-second mean?
Frame-per-second, abbreviated as fps, is the number of frames (images, pictures etc.) viewed on the screen every second. This method is used in videos. Normally, 24 fps is the average fps used by most videos and the human eyes can only detect individual frames as no more than 25 fps. Regardless, at higher fps (normally 60 fps) produces very smooth videos.
3. The spacing of the ticks in the animation chart is for an object bouncing with linear speed over 12 frames - draw a similar chart, but with ease-in and ease-out.
As the ball moves up, it decelerates due to gravity pull. At frame 4, it begins to ease-in, peaking at frame 6. After frame 6, it begins to fall down and accelerate, easing-out till frame 12.
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