A satellite travels at constant speed in a circular orbit. A student says that its velocity is constant, so the resultant force on it is zero.
Which statement corrects both errors?
Its direction changes, so an outward resultant force acts.
Its direction changes, so an inward resultant force acts.
Its speed increases, so an inward resultant force acts.
Its speed increases, so an outward resultant force acts.
80 exam-style questions on Edexcel GCSE Physics 7.1 The Solar System and gravity, covering 7.1.1 Weight and g on different bodies in space, 7.1.2 The Solar System, 7.1.3 Changing ideas about the Solar System, 7.1.4 Orbits of moons, planets, comets and satellites, and 7.1.5 Gravity and orbital motion. Each one has a worked solution and a mark scheme showing where the marks go.