F = ma
1Position plots consistent with constant speed *
2Final velocity after three disks collide simultaneously *
3Final speed after three disks collide in sequence *
4Acceleration of a cat pursuing a mouse *
5Friction pairs that keep stacked cylinders stable *
6Landing distance of a ball launched from different heights *
7Total energy equation for a walking linkage *
8Apparent spin of a top on a counter-rotating plate *
9Acceleration extrema of a mass on nested rotating circles *
10Maximum energy transfer from a heavy to a light object *
11Maximum energy transfer from a light to a heavy object *
12Maximum swing angle after a clay ball hits a pendulum *
13Speed and spin graphs of a slipping, then rolling ball *
14Comparing final speeds for balls that stop slipping *
15Relating angular velocities after an impulse on a double rod *
16Evolution of two connected soap bubbles *
17Long-term path in an inverse-square-like potential *
18Period of oscillation in a saddle-shaped potential *
19Wind turbine power scaling with height *
20Timing of a tossed spanner's closest return to an astronaut *
21Speed difference between two pipe sections *
22Height difference between two manometer tubes *
23Percent error in a measured spring constant *
24Return time for a bead impulsed on a tilted rod *
25Final speed of a puck sliding off a moving prism *
USAPhO
1A1. Shake It
2A2. Black Tides
3A3. Bitter and Magnetic
4B1. Scroll 'n' Roll
5B2. Where's the Kaboom?
6B3. Locked and Moded