A child whirls a conker on a string around their head. The conker moves with uniform circular motion. The linear speed of the conker is 5 m s−1 and the radius of the circle is 0.5 m.
An athletic hammer consists of a heavy metal ball on the end of a steel wire which is rotated around an athlete's head before being released.
The angular speed obtained by a training hammer thrown in a competition is 2 rad s−1. The combined length of the steel rope and the athlete's arms is 2 m.
What is the centripetal acceleration of the hammer?
A ball attached to a string rotates in a gravitational field with a constant time period in a vertical plane. The forces acting on the mass are tension, T and weight, W.
What is an expression for the magnitude of the tension in the string at the top of the circle?