• Springald physics mug, rotating view
  • Springald physics mug, close-up
  • Springald – Hooke’s Law pixel-art physics mug, black ceramic, view 1
  • Springald – Hooke’s Law pixel-art physics mug, black ceramic, view 3
  • Springald – Hooke’s Law pixel-art physics mug, black ceramic, view 4
  • Springald – Hooke’s Law pixel-art physics mug, black ceramic, view 5
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SpringaldHooke’s LawMug

Springald – Hooke’s Law Physics Mug

$21.99 USD
$21.99 USD
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Shipping calculated at checkout. Free US shipping · $10 flat shipping outside the US.
Size
11oz · 15oz
Made
To order · shipping times

Why does a spring return home? Springald stretches and snaps back. Hooke’s law, F = −kx, says the restoring force grows in proportion to the displacement and points the other way. It holds within the elastic limit; stretch too far and the spring deforms permanently. Pixel-art black ceramic mug in 11 or 15 oz; equation, symbols and sources in the physics panel below.

Size

Details

Size & material11oz · 15oz

Black glossy ceramic mug with a C-handle. Lead- and BPA-free.

  • 11oz: 0.33 l
  • 15oz: 0.44 l
CareDishwasher & microwave safe

Dishwasher safe (top rack) or hand wash. Microwave safe.

ShippingFree US

Free US shipping. $10 flat shipping outside the US.

Made to order: about 10 days of production and handling before it ships.

Delivery times & where we ship

Returns & replacements21 days

Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.

Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.

Full refund & replacement policy

The physics

Springald stretches, squashes and comes back.

Hooke's law, the first line, says a spring pulls back with a force proportional to how far you stretch or squeeze it, in the opposite direction. Twice the stretch, twice the force. Robert Hooke found the rule in the seventeenth century, and it describes everything from springs to wires to the bending of a ruler, as long as the deformation is small.

The minus sign is the bounce. Pull right and the spring pulls left; push left and it pushes right. The stored energy, the second line, grows with the square of the stretch, and it is handed back when the spring returns.

I ALWAYS BOUNCE BACK. holds within the elastic limit. Stretch a spring far enough and it no longer obeys the straight-line rule; stretch further and it deforms permanently and stays long.

Springald knows her limits. Inside them, she always comes home.

Equations

\[F = -k\,x\]
\[U = \tfrac{1}{2}k\,x^{2}\]
SymbolMeaningUnit
\(F\) restoring force exerted by the spring \(\mathrm{N}\)
\(k\) spring constant (stiffness) \(\mathrm{N/m}\)
\(x\) displacement from the natural length \(\mathrm{m}\)
\(U\) elastic potential energy stored \(\mathrm{J}\)

Sources

  1. HyperPhysics — Elasticity / Hooke's Law
  2. Encyclopaedia Britannica — Hooke’s law
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Field notes

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