that the head of the hammer is under the table.
come on people, just try it.
the hammer is actually stabilizing the ruler. the string is acting as a balance. therefore, the weight of the head of the hammer is pushing up on the handle and the ruler. so that, even though the weight of the ruler and head of the hammer are pulling down, the entire weight of the hammer is pushing up. so there is more force pushing up than is pushing down.
i’m a physics teacher, and use this a lot when i’m teaching about moments.
the head of the hammer is by far the heaviest part. this makes it the 