Could you download this zip file and play around this animation?
https://drive.google.com/file/d/1EfGjAcAignv0q1H8gY2fosMY2pVNGjrO/view?usp=sharing
And then,
Create at least 3 different size of balls.
Make a more complected slope that has several obstacles (shafts, bars).
Put gravity and contacts (boundary condition) . Then create an animation.
The animation should be uploaded to youtube. Put a link of animation here.
https://drive.google.com/open?id=1oTA7XgZnPCcQ0bvcgDUc4-Sh6P_4VkRW
https://drive.google.com/open?id=1q-kEA-xHGSNlXkNkd53GupPv5uhI4KJX
https://drive.google.com/open?id=10bTm487qePxgEq8PP_dlHk8j0L6UeVPk
https://drive.google.com/open?id=1oZMwrdWcIPOW4uqTfC03elt4f26JjaVw
https://drive.google.com/open?id=1C8W-ngEFTblxXM5Of3-h_FN_EgO_f52G
https://drive.google.com/open?id=1uIpdOJNVv8Ptqqw3opc7Evo7XoQ5KOCl
https://drive.google.com/open?id=1uIpdOJNVv8Ptqqw3opc7Evo7XoQ5KOCl
https://drive.google.com/open?id=1TGFPLh51-RkAfW3RrKAHuxkm6bQ3VUwe
https://drive.google.com/file/d/1peEF149xC0Gku0nKKM453LYO49L6NfYo/view?usp=sharing
https://drive.google.com/open?id=1-a6CiyfQYaQTD87404zrIyDRmt-YSKPL
https://drive.google.com/open?id=1TaSEOnLaXbEY98E_e2KhGImADKn3hp3G
https://drive.google.com/open?id=1s8wRJ5oZs87gsbUPOxy71aEM29w2cww3
https://drive.google.com/open?id=1wQwWZPwPh1m0VO1Bex0Al2j2KmVl77rN
https://drive.google.com/open?id=1hIPsWcR9bdgTXgRblImDyQfzKXoZM7bq
https://drive.google.com/open?id=16bHUwdcDHx4S7yjlH1PgKmlkjAlUtry0
https://drive.google.com/file/d/1xm5zeL3eYse123qzVeE4F0zO9PwERz-X/view?usp=sharing