applying the brake
The force of gravity keeps the space station in orbit as well as inertia that keeps the space station moving in a straight line.
A moving object keeps moving, unless you force it to stop. It keeps moving in a straight line, unless you force it to change direction. It keeps moving at a constant speed, unless you force it to speed up or slow down. A stationary object remains stationary, unless you force it to start moving.
Inertia
Inertia keeps them moving forward.
Gravity and inertia. Inertia keeps the planets moving while the gravity of the sun keeps the planets drawn to orbit in ellipses.
inertia keeps moving it!:)
inertia keeps the planets moving and spinning , and gravity is a force that attracts all objects toward each other.
Inertia
Gravity and inertia.
inertia
The force is inertia
Sun's gravitational pull keeps the earth in an elliptical orbit around it.If there would be no gravitational pull of sun on earth than the earth would start moving in a straight line at an angle of 90 degree like a tangent to a circle.