Gravity quiz

More questions about Gravity

These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.

1. 1 Easy

   On which planet would you weigh the most?

   Answer: Jupiter

   Why: Second place goes to Neptune, which pulls harder at its cloud tops than the far bigger Saturn.

2. 2 Medium

   What distance does the Moon drift away from Earth each year?

   Answer: About 3.8 cm

   Why: Earth's spin drags its tidal bulge ahead of the Moon, and that bulge tugs the Moon into a slowly widening orbit.

3. 3 Hard

   Which world's surface gravity almost matches that of Mars?

   Answer: Mercury

   Why: Mercury is smaller than Mars, but a huge metal core makes it far denser, so the two pull with nearly equal strength.

4. 4 Easy

   From which landmark is Galileo said to have dropped balls?

   Answer: Tower of Pisa

   Why: The story comes from a biography by his pupil Vincenzo Viviani, and most historians doubt the drop really happened.

5. 5 Medium

   When do spring tides happen?

   Answer: At new and full moon

   Why: The name comes from the tide springing forth, not the season, so spring tides arrive twice a month all year round.

6. 6 Hard

   How many Suns' worth of mass is the Milky Way's central black hole?

   Answer: About 4 million

   Why: Astronomers weighed it by tracking stars racing around it; one of them, S2, completes a lap about every 16 years.