Two solid spheres, one made of lead (heavier) and one made of aluminum (lighter), are released at the same time from the same height inside a vacuum chamber. Which option correctly describes what happens and the explanation?
Both spheres reach the bottom at the same time, because the acceleration of free fall is constant and independent of mass.
Both spheres reach the bottom at the same time, because both spheres experience the exact same gravitational force.
The lead sphere reaches the bottom first, because the gravitational force is larger on heavier objects.
The aluminum sphere reaches the bottom first, because lighter objects have less inertia so they are easier to accelerate.
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.