A skydiver jumps from a high-altitude airplane. After free-falling for several seconds, she opens her parachute and eventually slows down to a constant, safe speed before landing.
At which point is the upward force of air resistance acting on the skydiver the greatest?
Just after she jumps from the airplane
Just before she opens her parachute
Just after her parachute fully opens
Just before she touches the ground
245 exam-style questions on CIE IGCSE Physics 1.5 Forces, covering 1.5.1a Forces, resultant force and motion, 1.5.1b Load–extension graphs and the spring constant, 1.5.1c Friction and drag, 1.5.1d Force, mass and acceleration, 1.5.1e Motion in a circular path, 1.5.2a Moment of a force, 1.5.2b Principle of moments and equilibrium, and 1.5.3 Centre of gravity and stability. Each one has a worked solution and a mark scheme showing where the marks go.