Explain how we measure g using ticker-timer in the laboratory Where does the main problem arise

A weight falls As it falls, it pulls a tape through ticker timer Spacing of dots on tape increases steadily, showing weight is accelerating Analyse tape to find acceleration Main problem arises from friction between tape and ticker-timer. It slows down the fall of the weight so its acceleration is less than g. Friction is less of a problem if the weight is larger, thus falling more freely