F = ma
1Apparent transverse speed from a moving light source *
2Scaling of a domino wave's speed with size *
3Velocity components from a curved trajectory *
4Distance between two balls when one lands *
5Radius of the curve traced by dropped sand *
6Scaling of impact force with projectile speed *
7Stability of the Lagrange L2 point *
8Maximum height of a puck riding up a moving bump *
9Collisions needed for a bounced ball to escape Earth *
10Comparing surface gravity of a half-ball and cylinders *
11Track speed when a bead reaches a given tick mark *
12Tow rope tension for a wake surfer at constant speed *
13Total stopping time for a block bouncing between springs *
14Period of a small oscillation in a rigid-rod swing *
15Dependence of a rolling ball's final speed on friction *
16Locating a puck's second bounce inside a triangular rack *
17Speed of a sliding ladder's foot at a given position *
18Period ratio for a three-spring oscillator *
19Oscillation frequency of a pendulum on a sliding box *
20Motor motion that keeps a pivoted rod's angle fixed *
21Minimum jumps to escape a rotating merry-go-round *
22Angular acceleration of a braking tricycle on ice *
23Moment of inertia of a fractal hexagon pattern *
24Maximum speed for air to stay attached to a cylinder *
25Fastest-draining vase shape *
USAPhO
1A1. 404 Vision Not Found
2A2. Straight on a Cone
3A3. Storm Chaser
4B1. Radiant Bubbles
5B2. Say Cheese... It's a Conic
6B3. The Trojan Cylinder