HomeFrequently Asked Questions (FAQs)FAQs PhysicsFAQs Physics: Kinematics FAQs Physics: Kinematics 1465 ~ Explain, in terms of forces, how a speed-time graph change. ~ A metal sphere, mass 2kg and a wooden sphere, mass 1kg, of same size, are dropped at the same time from the same height of 5m, on Earth. Which sphere would hit the ground first? Explain. ~ Define speed, velocity, acceleration, uniform acceleration. ~ Define acceleration due to free fall. ~ Formulas for Kinematics.