Keith Chan
Physics Lab Planning (A) Research question "Investigate one factor that affects the bounciness of a dropped football." Hypothesis As the mass of the football increases, the bounciness of the football decreases. Explanation Bounciness is the ability of a substance to rebound. According to Newton’s Second Law (F = ma) where a (gravitational acceleration) is assuming to be kept constant on Earth, the gravitational force (downwards) acting on the football as it leaves the ground after rebound increase as the mass of the football increases. The football is being ‘pulled’ downwards. Thus, the ability to rebound decreases leading to a decrease in the bounciness of the football. Variables 1. Independent variable: Mass 2. Dependent variable: Bounciness (the height of which the ball can rebound)
Football
Rebound height * The rebound motion should be exactly vertical. Dia. 1 The rebound motion of the football.
3.
Constants: Height of which the football was dropped Temperature of the surrounding Material and size of the football (i.e. using the same football throughout the experiment)
1