[Physics] Why are some jenga pieces easier to remove than others

classical-mechanicsnewtonian-gravitystatics

Jenga is a game place with wooden blocks stacked on top of one another in an alternating pattern. Players take turns removing blocks from any layer and placing them on top.

As the game progresses the tower gets higher and higher until it collapses.

For a given configuration of blocks is there a way to calculate wither the tower is going to collapse?

I also want to know why some pieces are easier to remove than others…

Best Answer

The pieces that support the most weight have higher friction and are more difficult to remove. The easier it is to remove a piece the less important it is structurally. Each block needs to support the weight of all the blocks above it, and it has to have at least 3 contact points spread apart like a three legged chair. With two contacts points it will create a joint and the whole tower will collapse like in the neat GIF you posted.