A small ball attached to a string is whirled in a horizontal circle at a constant speed.
Explain why it is incorrect to say that the ball is moving with a constant velocity.
A force must act on the ball to keep it moving in this circular path.
Explain why a force is required to maintain this circular motion.
State the direction in which this force acts.
Identify the physical source of this force.
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.