Kinetic energy is moving energy
green marble is not fit for home because you can't find small thinks if it dropped on the floor.
You ate food.Your body took energy from the food and stored it in your muscles.You transferred the energy from your muscles to the marble, when you LIFTED the marble against gravityand placed it on top of the roller coaster. Up there, the energy it had was potential. As it fell to lower heights,that potential energy became kinetic energy.
Potential Energy changes to Kinetic Energy.
Depends on the density of the marble, as well as its weight. And on the dryness and sizes of the sand particles. Try out a few experiments.
Neither ... they would fall together.
yes mechanical enery
it is the difference of the potential energy when the body is on the table and from the position where it is dropped.
The tree was 26.5 m tall.
The same as it's potential energy
Only one marble comes off because the energy is transferred through the line of marbles and is expelled at the end driving the last marble to release
Since the penny was up and stationary before (in your hand or wherever), it had potential energy at first. When it's dropped, it is converted into kinetic energy (energy of motion).
You have converted potential energy to kinetic and then back to potential. If the marble came back exactly to its starting point you would have invented perpetual motion, but in fact it will lose a little energy in friction against the tube so it will gradually lose energy and eventually just stop at the lowest point of the tube.