This classic demonstration of angular momentum needs only a rotating stool and two hand weights. Start by spinning on the stool with the weights far from the axis of rotation, giving you a large moment of inertia. As you bring the weights closer to the axis of rotation, your moment of inertia decreases. By conservation […]
One of the cookie cans has weights around the edge while the other has weights concentrated in the center. The one with weights around the edge have a high moment of inertia and therefor resistant to turning quickly resulting in the cookie can with the weights in the center to win.
When rolling a hardboiled egg and an uncooked egg down a slope, the raw one will reach the bottom first. This is because the hardboiled egg requires a lot of rotational energy as the shell, egg white, and yolk need to be set in rotation. On the other hand, only the shell of the uncooked […]
Intuitively we know that if we drop a feather and a coin from the same height, the coin will reach the ground first. However, this is due to the difference in air resistance between the feather and coin. When placing these items in a vacuum, removing the air, we see that the feather and coin […]
Through the conservation of energy, once the croquet ball is released at a certain height the potential energy is converted to a combination of kinetic and potential energy. As long as no additional velocity was added to the system in the beginning, the ball should return at the same point at the end of it’s […]
Because of the way that the balancing bird is spreading its wings, it is able to distribute its weight in such a way that it creates a center of gravity right below the beak. Having the center of gravity below the beak allows the bird to be balanced on a finger.
Granular material of varying sizes, like sand with nuts in it, are all placed in a container the center of mass of the system is likely not at the lowest point. When the container is disturbed from shaking the larger particles like the nuts tend to be displaced towards the top so that most of […]
If the pages of two phonebooks are stacked with one another connecting the two books, it becomes seemingly impossible to pull the books apart. The harder you try to pull the two books apart, the harder the stacked pages in the middle are squished together, increasing the normal force and thus the overall force of […]
When dropping a singular ball, it can be seen that it does go as high as it was dropped from. When stacking them however, once they all hit the ground, the linear momentum of the bottom ball transfer to the next ball and continues until all the linear momentum of the system is in the […]