Centrifuges
Scientists use centrifuges to produces gravity simulations. These simulations can be produced both on Earth and in space. When an object moves in circle, it requires a constant force towards the center of a circle to maintain its motion. The object has the tendency to move along the tangent of the circle if the force ceases to exist. The object experiences a force that is radially outward. The speed of the centrifuge can be adjusted so that the centrifugal force is similar in magnitude to the gravitational force on Earth. Since microgravity results in adverse effects on the health of the astronauts, centrifugal mechanisms can keep them in good health for future missions.
-- A Centrifuge Chamber is used to simulate microgravity.