If gravity is the only force acting on an object then what fiction is it?

Which type of wave has movement that is parallel to the direction of the wave? How does the phase-shift oscillator get its name? What was Hans bethe's explanation towards fusion? What is defined as the amount of matter something has? Light consists of bundle of energy called? Does vacuum conduct heat? Why is metal not a good insulator of electricity? How do wire go to the coil? What is 4000 grams? Both food and air travel through what? What is it called when Force applied to a simple machine? What is the refractive index of vacuum? When light shines on a metal surface the maximum energies of emitted electrons? A green object appears green because? How can the density of a material be used to determine if it will float or sink in water? Is it false that balance forces are equal forces acting on an object in opposite directions? How many kilos is five and a half pounds? What is it call when a measure of the energy in a wave? Why don't clouds fall to the ground and crush buildings and kill people if they really are made of thousands or millions of pounds of water? Were is the sun's energy stored?

If gravity is the only force acting on an object then what fiction is it?