With myself above you, I can use gravity instead of working against it.

Instead they use gravity to give them forward speed.

Suspension devices use your own body weight and gravity to create resistance.

"They're using artificial gravity in this section," she said over her shoulder.

That's quite clever, use gravity to help you along.

The new chair uses balance and gravity to do most of its work.

It is also possible to have a hybrid system that uses gravity and pumping.

Originally the railway was powered by a simple system using water and gravity.

This is a gentler process, using gravity, rather than a pumping system.

The column is run using either gravity or a pump.