PHYSICS · Multi-part · GCSE · Physics · Energy · Energy
Problem
A rubber ball of mass 200g is moving with a speed of 5m/s. Answer the following questions without performing detailed numerical substitution; base your reasoning on the mathematical relation between kinetic energy, mass and speed.
(a) Explain qualitatively how the kinetic energy of the ball will change if its mass is doubled while its speed remains the same.
(b) Explain qualitatively how the kinetic energy will change if its speed is doubled while its mass remains the same.
(c) By what factor will the kinetic energy change if both the mass and the speed are tripled simultaneously? Justify your answer algebraically.