A student drops a small rubber ball of mass 0.15 kg0.15\text{ kg}0.15 kg from a balcony. The ball starts from rest, 12 m12\text{ m}12 m above a flat stone courtyard.
Calculate the gravitational potential energy of the ball relative to the courtyard floor standardly using g=9.8 m/s2g = 9.8\text{ m/s}^2g=9.8 m/s2.
The student releases the ball and it falls towards the courtyard. The ball strikes the floor and bounces vertically upwards. The speed of the ball immediately before it strikes the floor is 15 m/s15\text{ m/s}15 m/s. The speed of the ball immediately after it strikes the floor is 11 m/s11\text{ m/s}11 m/s.
Calculate the kinetic energy of the ball immediately after it strikes the courtyard floor.
Show that the change in momentum of the ball when it bounces off the floor is 3.9 kg m/s3.9\text{ kg m/s}3.9 kg m/s.
The ball is in contact with the courtyard floor for 0.15 s0.15\text{ s}0.15 s. Calculate the average resultant force on the ball when it is in contact with the floor.
78 exam-style questions on CIE IGCSE Physics Momentum, covering Momentum. Each one has a worked solution and a mark scheme showing where the marks go.