Questions 1. No. The mass of the pulley is multiplied by 0.5 then added to the masses of the two masses on the pulley. The mass of the pulley was 114 grams and the two other masses were not big enough to make this value insignificant. 2. Gravity on Venus is slightly less than that of Earth’s so the rotational speed of the pulley would decrease. With less gravity it would take more time to accelerate the masses, thus slowing down the rotational speed of the pulley. 3. Yes. A ball such as a heavy metal ball bearing will experience much less friction than a bouncy ball. Metal on metal slides easily and there isn’t much friction but friction is much greater in a rubber on metal situation.
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