A satellite moves at constant speed in a circular orbit. After half an orbit its velocity is opposite to its initial velocity.
Which statement explains this motion?
Gravity acts along the motion, changing direction but not speed.
Gravity acts at right angles to the motion, changing speed but not direction.
Gravity acts at right angles to the motion, changing direction but not speed.
Gravity acts along the motion, changing speed but not direction.
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.