F = ma

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1Angular momentum and acceleration directions in a turn *

2Force direction a rolling ball exerts on a ramp *

3Volume of an object pressed fully underwater *

4Particle counts for exploding fragments *

5Lean angle of a unicyclist in a turn *

6Bouncing block inside a frictionless box *

7Mass of a balanced meter stick *

8Oscillation period after cutting a spring in half *

9Velocity from a force-time graph *

10Time before a spinning string breaks *

11Kinetic versus potential energy of a spring oscillator *

12Scaling of a paper helicopter's fall time with height *

13Scaling of a paper helicopter's fall time with rotor radius *

14Fraction of kinetic energy that is translational for a rolling disk *

15Maximum speed of a constant-power car on an incline *

16Bounding the speed ratio in a 1D collision *

17Surface gravity of an expanding dust cloud *

18Scale readings in a pulley-box puzzle *

19Shape of a cable trailing a moving helicopter *

20Rocket firing time to spin up a space station *

21Comparing accelerations for two different pulleys *

22Angular momentum after shifting mass between orbiting bodies *

23Impulse from firing a bowling ball launcher *

24Maximum turn angle from firing a launcher *

25Rebound height on a frictional second ramp *

USAPhO

PDF организаторовВсе заданияВсе решения

1Problem A1

2Problem A2

3Problem A3

4Problem A4

5Problem B1

6Problem B2