- #1
ProPM
- 66
- 0
I was watching a video and it showed a man going up a hill through a lift. The engine did work on him so he could gain height/GPE energy. Once he got up there they portrayed two scenarios. In the first one he went down like a normal skier.
In the second example, he simply jumped off the cliff and as he lost height, he gained speed and therefore gained KE and when he got to the ground they said the energy was not destroyed, it is used to do work to dig him into the snow. Now, he doesn’t dig himself down forever, he eventually stops. I wanted to know whether he stopped digging down simply because all Kinetic Energy was used doing work (e.g: He had 1000J energy right before he hit the snow and moved 10 m down, he exerted a force of 100 J) but we have to factor in friction doing work against him right? And also, what kind of energy is he transferring? His Kinetic Energy to Kinetic energy of the snow? And the snow stops moving when he stops moving: That’s because of friction too? Basically I'm confused how the skier uses his Kinetic Energy to do work in this scenario.
Thanks
In the second example, he simply jumped off the cliff and as he lost height, he gained speed and therefore gained KE and when he got to the ground they said the energy was not destroyed, it is used to do work to dig him into the snow. Now, he doesn’t dig himself down forever, he eventually stops. I wanted to know whether he stopped digging down simply because all Kinetic Energy was used doing work (e.g: He had 1000J energy right before he hit the snow and moved 10 m down, he exerted a force of 100 J) but we have to factor in friction doing work against him right? And also, what kind of energy is he transferring? His Kinetic Energy to Kinetic energy of the snow? And the snow stops moving when he stops moving: That’s because of friction too? Basically I'm confused how the skier uses his Kinetic Energy to do work in this scenario.
Thanks