Physik – Energieerhaltung im Fadenpendel?

Aufgabe A ist ja kein Problem, aber bei Aufgabe b habe ich jetzt schon so viel eingesetzt und hin und her geschoben, weiß irgendwer, wie man da auf das richtige Ergebnis kommt, ich weiß nicht mehr weiter?

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MB08132003
2 years ago

Maximum potential energy is at maximum deflection, since is kinetic energy 0

Epotv=m*g*h (if the zero level is at rest), Ekinv=0

Maximum kinetic energy is when passing through the rest position

Epotn=0 (because we are at zero level), Ekinn=1/2mv^2

Energy conservation

So: Egesvorher=Egesnacher

Epotv+Ekinv=Epotn+Ekinn

m*g*h+0=1/2mv^2+0

This cuts the m away, and you can leave the zero, of course.

Hacken90
2 years ago

In Part (a), you have certainly recognized that the potential energy (lease energy) is converted into kinetic energy (speed energy).

The potential energy is calculated with m * g * h, the kinetic energy is calculated with m * v2. Since at maximum speed the entire potential energy has been converted into kinetic energy, you can equalize the two terms and convert them to v. You can shorten the m and pull the root for the v2.

Myrine
2 years ago

Potential energy: E_pot = m • g • h

Kinetic energy: E_kin = 1/2 • m • v^2

Equate, divide by m, multiply with 2, drag root.

Maxi170703
2 years ago

The approach is E_pot = E_kin