Physics 12 · Gravity Field Explorer

Physics model and safety

For central gravitational parameter μ=GM and center-to-center distance r=R+h, gravitational acceleration is μ/r² and force on a small test body is mμ/r². Inverse-square strength depends on radial distance from the center, not just altitude. Double radial distance and g or force becomes one quarter. Constants: Earth μ=3.986004418×10¹⁴ m³/s², radius 6371 km; Moon μ=4.9048695×10¹² m³/s², radius 1737.4 km.

1. Predict, set and calculate

My prediction before changing the model

Central body

Altitude above reference surface 0 km

Test mass 10 kg

Diagram orientation 0°

Import JSON

2. Visualize forces and motion

Schematic only. Vector arrows are directional, not drawn to physical scale. The mathematical readout provides the exact values for accessible use.

3. Compare altitude and the calculated result

Calculated inverse-square gravity at selected altitudes (synthetic)
Altitude (km)	r (km)	g (m/s²)	Force (N)	g / surface g

4. Portfolio notebook

Saved model results for this device
#	Body	Altitude (km)	Mass (kg)	g (m/s²)	Force (N)

Claim, two numerical pieces of evidence, equations, assumptions and next investigation

Download gravitational field synthetic dataset

5. Seven-round calculation challenge

Seven distinct challenges randomized from eleven Earth/Moon cases. Feedback identifies the formula and explains center-to-center distance.

Start a new game.

Score: 0 of 7