01 JUICE BOXS:
I created an animation demonstrating the difference in weight by showing an empty juice carton and a full one falling from the same height, using variations in speed, bounce, and settling to convey the sense of lightness and heaviness.
https://syncsketch.com/sketch/TPqOqNgWTP0C/
02 PENDULUM ANIMATION:
https://syncsketch.com/sketch/G0Kk6o7UsjbL