Resolving motion into components
Use perpendicular vectors to describe a projectile before choosing motion equations.
Loading personal best…Year 12 · SACE Stage 2
Motion and relativity
Practise projectiles, momentum, circular motion, gravitation and special relativity.
Subtopics
Horizontal launches and drag
Connect vertical fall time to horizontal range and evaluate the no-drag model.
Loading personal best…Angled launches and range
Model height, time, range and velocity while recognising the assumptions behind optimal angles.
Loading personal best…Impulse and changing momentum
Use vector momentum changes and the area under a force–time graph.
Loading personal best…Momentum conservation in two dimensions
Apply independent component balances to collisions and explosions.
Loading personal best…Rockets, ion thrusters and solar sails
Use momentum transfer to calculate rocket recoil and photon impulses.
Loading personal best…Uniform circular motion
Relate period, speed, inward acceleration and the actual forces that cause turning.
Loading personal best…Flat and banked curves
Resolve real contact forces to explain road banking and its limits.
Loading personal best…Universal gravitation and field strength
Use inverse-square gravity and distinguish force from gravitational field strength.
Loading personal best…Circular satellites and useful orbits
Derive orbital speed and connect orbit geometry with satellite uses.
Loading personal best…Kepler’s laws and orbital data
Interpret elliptical motion and use period–radius data to infer a central mass.
Loading personal best…Inertial frames and relativity postulates
Explain why high-speed measurements require a frame-dependent account of time and length.
Loading personal best…Time dilation and particle lifetimes
Distinguish proper time from laboratory time and calculate fast-particle lifetimes.
Loading personal best…Length contraction and relativistic momentum
Use frame-dependent lengths and momentum while avoiding photon and mass misconceptions.
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