Which items will balance each other out in SMM2?

super-mario-maker-2

In Super Mario Maker 2, Nintendo has added the seesaw item, which will tilt in either direction based on the weight of the items on it. Is there a master list of how much each item weighs?

Solution 1:

In my own extensive experimenting, these were the results I came up with. The weights below are proportional to Mario.

0 Marios

These items can be pushed by the seesaw, but cannot weigh it down.

Thwomp
Twister

0.5 Marios

Buzzy Shell
Spiny Shell
Dry Shell

0.75 Marios

Super Mushroom
1-up Mushroom

1 Mario

Coin dropped by a POW blast
Fire Flower
Superball Flower
Empty Goomba Shoe
Goomba
Koopa Troopa
Buzzy Beetle
Spike Top
Blooper
Spiny
Piranha Plant
Monty Mole
Rocky Wrench
Hammer Bro
Unchained Chomp
Chain Chomp pole
Boo
Bob-omb
Dry Bones
Magikoopa
P-switch
POW Block
Trampoline
Rotten Mushroom
Green Yoshi

1.25 Marios

Big Mushroom

1.75 Marios

Red Yoshi

2 Marios

Muncher
Chained Chomp
Goomba Shoe with the Goomba
Wiggler
Bowser
Bowser Jr.
Boom Boom
Bill Blaster (any height)
Cannon

3 Marios

10-coin dropped by a POW blast

Notes

The big variant of all items doubles that item's weight. All other transformations do not affect the weight of the item, with the exception of the shells listed as 0.5 Marios and the two Yoshi variants.
SM3DW-exclusive items do not appear on this list, as seesaws are unavailable in the SM3DW theme.
Weights are stackable and transitive; two items each weighing 1 Mario will balance out one item weighing 2 Marios. Goomba shoes, for instance, weigh 1 Mario on their own and contain a Goomba weighing 1 Mario; they will exactly balance out a Muncher.
Objects which bounce, such as Unchained Chomps, do have weights; they just won't balance the seesaw unless they remain on the ground, such as a Chained Chomp immediately before it attacks, or unless they are stacked on an enemy which remains on the ground. However, all bouncing items will cause the seesaw to wobble when they hit the seesaw.
- The Super Star and Koopa Clown Car will therefore cause the seesaw to wobble, but as I'm unaware of a way for them to remain stationary on the ground, I can't measure their weights.
Objects which do not interact with the ground, such as Super Leaves and Propeller Mushrooms, can neither push nor be pushed by the seesaw.
Mario's powerup has no impact on his weight; small, big, and mega Mario all weigh the same.

All of the above is true provided that all items are an equal distance from the fulcrum of the seesaw. Seesaws in this game actually obey the physics of torque.

Torque is defined as force times the distance the object is from the fulcrum (τ=f*d). SMM2 actually implemented this, just like an IRL seesaw, with some rounding on the distance. So, for example, a fire flower placed at six blocks from the fulcrum will exactly balance out a Muncher placed at three blocks from the fulcrum. If the larger distance is odd, the smaller distance is rounded up; a fire flower at five blocks from the fulcrum will also balance out a Muncher at three blocks.