Science Goes to the Olympics
Briefly

An external force, gravity, acts on Stevens throughout her routine. She controls the speed of rotation by expanding or retracting her limbs. When she lands, the force she applies converts kinetic energy into stored potential energy, then back into kinetic energy for upward propulsion.
Maximizing lift, Stevens employs her leg and core muscles to thrust off the tarp, introducing an additional force. Timing her jump with the bed's rebound optimizes height and momentum, accentuating the significance of the 0.3 seconds of contact.
Rowing synchrony is crucial; starting with leg power, then arms, force must peak when oars are perpendicular to the boat, ending in complete stroke synchrony at the release. Recovery focuses on maintaining momentum.
Read at www.nytimes.com
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