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Find the motion equation

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Theoretical Physics,IV

1) A half-pipe at a skateboard park consists of a concrete trough with semi- circular cross section of Radius R = 5 m. Find the motion equation. Find the amplitude and the initial phase of oscillations in dependence on initial angle (φ) value a0 and and its derivative ˙φ equal b0. Fig. 1.

2) Let us consider a cart moving on a horizontal track in a medium that produces a liner drag force −→

F = −const−→v . Find the position depending on time in such a motion. Fig. 2.

3) Let us consider a projectile that is subject to linear air resistance and is thrown vertically downward. Find the terminal speed. Fig. 3.

Fizyka Teoretyczna, lista IV

1) Betonowa rynna w skateparku ma p´o lkr¸ag ly przekr´oj o promieniu R = 5 m.

Znale´z´c r´ownanie ruchu. Znale´z´c amplitud¸e oraz faz¸e pocz¸atkow¸a oscylacji w zale˙zno´sci od a0 - k¸ata pocz¸atkowego (φ) oraz b0 - warto´sci pocz¸atkowej jego pochodnej. Fig. 1.

2) Rowa˙zmy w´ozek poruszaj¸acy si¸e po poziomej drodze w o´srodku, w kt´orym si la opisywana jest wzorem −→

F = −const−→v . Znale´z´c zale˙zno´s´c po lo˙zenia od czasu. Fig. 2.

3) Rozwa˙zmy w´ozek, kt´ory rzucony jest pionowo na d´o l i podlega liniowej sile oporu. Znale´z´c pr¸edko´s´c terminaln¸a. Fig. 3.

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