Science · Can you solve it? Isaac Newton’s tower drop puzzle
Isaac Newton's tower drop puzzle reveals eastward deflection through angular momentum
Why it matters
The puzzle demonstrates a counterintuitive principle of classical physics that shaped scientific understanding of rotation and gravity, with practical implications for objects falling from great heights on a rotating planet.
The brief
In 1679, Isaac Newton posed a puzzle in a letter to Robert Hooke: where does an object land when dropped from a high tower, accounting for Earth's rotation?[1][2]
The answer defies intuition. The object lands slightly to the east, not to the west or directly below. This happens because the falling object conserves angular momentum as it descends toward Earth's center.[3] As the object's distance from Earth's rotational axis decreases, its angular velocity must increase to maintain constant angular momentum—the same principle that causes a spinning ice skater to accelerate when pulling in their arms.[4]
The effect, though small, is measurable. If the Eiffel Tower were positioned on the equator, the eastward deflection would reach approximately 11 centimeters.[5] The puzzle proved pivotal in the development of classical physics and continues to illustrate how gravity, rotation, and conservation laws interact.
What we don’t know yet
- In 1679, Isaac Newton posed a puzzle in a letter to Robert Hooke about where an object lands when dropped from a high tower, accounting for Earth's rotation Only theguardian.com reports this so far.
- An object dropped from a high tower lands slightly to the east Not yet confirmed by an independent source.
- A falling object conserves angular momentum as it descends toward Earth's center Only theguardian.com reports this so far.
- As an object's distance from Earth's rotational axis decreases, its angular velocity must increase to maintain constant angular momentum Not yet confirmed by an independent source.
Quick answers
- What happened?
- In 1679, Isaac Newton posed a puzzle in a letter to Robert Hooke: where does an object land when dropped from a high tower, accounting for Earth's rotation?
- Why does it matter?
- The puzzle demonstrates a counterintuitive principle of classical physics that shaped scientific understanding of rotation and gravity, with practical implications for objects falling from great heights on a rotating planet.
- How was "Isaac Newton's tower drop puzzle reveals eastward deflection through angular momentum" verified?
- Citelink grounded this brief in 2 sources, including Guardian Science. Every claim links to its citation in the sources list below.
Grounding — every claim checked against sources
of 5 grounded3In 1679, Isaac Newton posed a puzzle in a letter to Robert Hooke about where an object lands when dropped from a high tower, accounting for Earth's rotation
An object dropped from a high tower lands slightly to the east
A falling object conserves angular momentum as it descends toward Earth's center
As an object's distance from Earth's rotational axis decreases, its angular velocity must increase to maintain constant angular momentum
If the Eiffel Tower were positioned on the equator, the eastward deflection would reach approximately 11 centimeters
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Run any claim in this Brief through Citelink's verification engine yourself.
Sources
Guardian Science ·
Guardian Science ·
How this brief was made
Citelink’s automated pipeline wrote this summary from the 2 sources listed above, then checked each claim against them before publishing. Briefs are not individually reviewed by a person before they go live, so read the original reporting for the full story.
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