Which statement about a satellite in a stable circular orbit is correct?
The resultant force on it is zero, so it moves at a constant velocity
The resultant force on it is towards the Earth, so it is accelerating
The resultant force on it is along its path, so it keeps on moving
The resultant force on it is away from the Earth, so it stays in orbit
50 exam-style questions on OCR GCSE Physics 8.3 Beyond Earth, covering 8.3.1 Red-shift and the expanding universe, 8.3.2 Evidence for the Big Bang model, 8.3.3 Formation of the Sun and stellar equilibrium, 8.3.4 Radiation emitted by hot bodies, 8.3.5 The solar system and satellites, 8.3.6 Gravity and circular orbits, 8.3.7 Orbital radius and orbital speed, 8.3.8 Radiation balance and the temperature of the Earth, and 8.3.9 Seismic waves and exploring hidden structures. Each one has a worked solution and a mark scheme showing where the marks go.