Physics: Work. Conservation of energy (8)

Physics: Kinetic energy. Work. Gravitational potential energy. Total mechanical energy. Conservation of mechanical energy. Spring potential energy. Conservation of energy problems

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(1) Kinetic energy. Work
(2) Continued. Gravitational potential energy. Total mechanical energy. Conservation of mechanical energy
(3) A conservation of energy problem
(4) Continued
(5) Another conservation of energy problem
(6) Continued
(7) Spring potential energy. A spring problem
(8) Continued

Category:

Education

Tags:

• physics
• kinetic
• energy
• work
• gravitational
• potential
• total
• mechanical
• conservation
• of
• spring
• problems

[mandygirl777]

@rafael1877 This is because they treated 7m as a height of 0. So for the 11m mark this became 4m

[qusaiw1993]

But we take friction in some exercises

[Kingofallcereal]

@rafael1877 k=4 in the elastic potential energy equation, 1/2*k*x^2. Its not height

[rafael1877]

why do you get 4 for height???? i dont understand that, everything else i great.

[kosahor]

Thanks for the videos..i made all the mistakes you said some students would make so this really helped..

[kosahor]

@savedbylove131000

There arent kinetic energies for the spring because the force along an extended/compressed spring is variable, meaning there isnt constant acceleration meaning velocity changes

[WongeneKIM]

Thank you for your lectures!

[savedbylove131000]

why aren't there two kinetic energies for the spring?

[BurntFlower88]

Thank you, very informative!