Since the change in kinetic energy is still zero, this means that the positive change in gravity potential energy is equal to the negative of the change in internal energy. Let’s say you have 75 kilograms (165 pounds) mass. This means that the movement of 1 meter will reduce your internal energy 735 Joule. This is called exercise.
Staircase climbing stairs
Now we can go back to the original question: What does the work-energy principle say against the staircase climbing machine with stairs? We already had a stair climbing physique. It is the same calculation if you enter a 1 -meter table or climb 100 stories – a different value for height. But let’s assume that you stay in the same place while moving under the stairs. If someone measures your further movement, he says that your speed is zero. Your height does not change either, so now the work-energy equation seems to be as follows:
This says that the change in interior energy is zero, so you can’t burn any calorie. So, that can’t be true… right? Then how do we fix this? I will use a beautiful example based on this This video from Steve Mold. He goes: Imagine that you climb with a moving escalator moving down. Again, an observer on the ground sees you as fixed. However, we can also measure your speed from the reference frame of the escalator and move upwards.
In fact, if you were the walls and ceiling of the escalator, you wouldn’t be able to say that you stayed in place. You don’t even know that the stairs are moving. Since the stairs move at a constant speed (zero acceleration), this will be a inertia reference frame. In physics, any inertia reference framework is valid as any other reference framework – the basic laws of physics remain the same. So, in terms of the escalator frame existing To move up and do business. The same as a fixed frame is walking.
But actually the stair climbing is more difficult
I said the staircase climber and the climbing stairs were the same – but not. In fact, climbing 100 times is easier than the equivalent distance in the stair climber. Does this look crazy? A little crazy. The reason they are different is the gravity area (G) never really fixed.
Remember, we defined the potential energy of gravity as follows U = mxgxy? This is not really wrong, but a little misleading. In fact, the potential energy of gravity for the soil-to-house system will be defined as the following:
