Why Planets Spin: Concepts from the Video
Medium-difficulty multiple-choice quiz for grades 6–8 that checks understanding of core ideas about how planets and other bodies gain rotation and how that rotation changes over time.
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Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: What main idea explains why many planets rotate?
Conservation of angular momentum from the spinning gas and dust they formed from
Solar wind directly forces most planets to rotate
Magnetic fields continuously push them to spin
Planets are born spinning due to internal nuclear reactions
Question 2: How can a collision change a planet’s spin?
Only collisions with comets change rotation, not asteroids
Collisions cannot affect rotation because spin is fixed at formation
Collisions always make rotation faster
A collision can speed up, slow down, or tilt a planet’s rotation depending on impact direction and size
Question 3: What role does tidal friction play in a planet-moon system?
It instantly locks planets into the same rotation period as their orbit
It transfers angular momentum and can slow a planet’s rotation while moving the moon outward
It generates magnetic fields that speed up rotation
It has no long-term effect on rotation or orbit
Question 4: Why do some bodies show synchronous rotation (same face toward partner)?
Because they were formed that way and never changed
Because magnetic attraction fixes their orientation
Because tidal forces over time lock their rotation to match their orbital period
Because they orbit too slowly to rotate separately
Question 5: Which statement best describes angular momentum conservation during planet formation?
Angular momentum only matters for stars, not planets
Angular momentum is destroyed and spin appears spontaneously
Angular momentum always increases during collapse
The total angular momentum stays the same, so rotation speeds up as size decreases
Question 6: What common myth about planet rotation does the video challenge?
That only gas giants can rotate
That rotation is caused by internal heat alone
That planets always keep the spin they had when they formed and never change
That moons cannot affect a planet’s spin
Question 7: Which scenario would most likely increase a planet’s rotation rate?
A prograde, off-center impact adding angular momentum in the spin direction
Slow, symmetric accretion evenly distributed around the planet
A retrograde impact opposite the spin direction
A head-on central collision directly through the rotation axis
Question 8: How does the distribution of mass inside a planet affect its rotation changes?
Mass concentrated near the center makes spin harder to change than mass spread outward
Mass distribution has no impact on rotational behavior
Mass near the surface always prevents tidal locking
Only surface features affect rotation, not internal mass