F = ma
1Height of hoops an arrow passes through *
2Angular velocity for a rider's feet to lift off *
3Tension and compression in a truss bridge *
4Kinetic energy graph of a bouncing elastic ball *
5Scale reading as a block slides down a ramp on it *
6Water dripped from a swinging leaky bucket *
7Velocity versus position from a velocity versus time graph *
8Speed of a sliding rod's midpoint *
9Stopping distance on a road that turns to ice *
10Equilibrium radius of a block spun between two springs *
11Force to pull apart a pressure-sealed sphere *
12Torque on a probe from three asteroids *
13Tension in a string as blocks are released, versus separation *
14Angle traveled by a bead before matching its hoop's speed *
15Constructing a dimensionless number for viscous drops *
16Maximum landing distance released from a swinging rope *
17Rope displacement between two equilibria with springs *
18Delta-v to reach a larger elliptical orbit *
19Oscillation frequency of an unbalanced spoked wheel *
20Oscillation period of a spring-braced hinged square *
21Force to push water out of a tapering syringe *
22Gravity jump across a thin spherical shell *
23Steady bounce height off a rising paddle *
24Scaling of displacement at half terminal velocity in fluid *
25Acceleration of a yo-yo while unwinding *
USAPhO
1A1. Ping Pong
2A2. Stellar Stability
3A3. Tilt Shift
4B1. The Muon Shot
5B2. Solid Heat
6B3. Quality Quest