Two metal spheres of different masses, m1 m_1\,m1 and m2m_2m2 (where m1>m2m_1 > m_2m1>m2), are released simultaneously from rest from the top of a vertical vacuum chamber.
What will happen and why?
Both spheres reach the bottom of the chamber at the same time, because the acceleration of free fall is independent of mass.
Both spheres reach the bottom of the chamber at the same time, because they fall at a constant speed.
The heavier sphere reaches the bottom first, because the gravitational force acting on it is greater.
The lighter sphere reaches the bottom first, because it has less inertia.
204 exam-style questions on CIE IGCSE Physics Motion, covering Motion. Each one has a worked solution and a mark scheme showing where the marks go.