A tennis player strikes a tennis ball with a racket. During the brief collision, the racket exerts a force on the ball, causing it to deform and change its direction of travel. Which of the following properties of the tennis ball remains completely unchanged during this collision?
the velocity of the ball
the shape of the ball
the mass of the ball
the acceleration of the ball
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.