GForce facts for kids
The gforce of an object is its acceleration relative to free fall. On earth the force is 1g, or 9.8 meters per second squared (m/s2), but astronauts experience unusually high and low gforces. gforce can also be seen on rollercoasters. When the coaster goes down the drop, you are pushed back into your seat because of gforce.
Images for kids

This topfuel dragster can accelerate from zero to 160 kilometres per hour (99 mph) in 0.86 seconds. This is a horizontal acceleration of 5.3 g. Combining this with the vertical gforce in the stationary case using the Pythagorean theorem yields a gforce of 5.4 g.

The Superman: Escape from Krypton roller coaster at Six Flags Magic Mountain provides 6.5 seconds of ballistic weightlessness.
See also
In Spanish: Fuerza g para niños