Demo · schematic roomReady
Tap any object. Cyan lines are its pull on you; brighter is stronger.
No objects yet.
Your mug pulls on you, and you pull back on it with exactly the same force.
A 7 kg bowling ball pulls 20 times harder than a 350 g mug at the same distance.
Twice as far means a quarter of the pull. Ten times as far, one hundredth.
Room objects pull with billionths of a newton. Earth pulls with hundreds.
Sensors in your iPhone SE that the scanner now uses.
This is the one number here that is measured, not estimated. The chip has a small offset of 1 to 2%. Lay the phone flat and still, capture face up, then face down. Averaging the two cancels most of the offset.
In live mode the scanner uses this height and your tilt automatically: anything standing on the floor gets its distance from where it meets the floor, and things resting on a table get the table's distance. Set the height to where you hold the phone. To measure one object by hand, aim the center crosshair at where it touches the floor and tap Apply.
The Sun pulls on you hundreds of millions of times harder than anything in the room. You still never feel it, because you and Earth fall around the Sun together. What you can feel from the Moon and Sun is the tiny difference across Earth's width: the tides.