global warming definition. The term attached to the notion that the Earth's temperature is increasing due to the greenhouse effect. Note: Whether global warming is actually happening is a subject of scientific debate.
Like jet airplanes, space rockets work on a principle called action and reaction (another name for Newton's third law of motion). The massive force (action) generated by hot gases firing backward from a rocket's engines produces an equal force (reaction) that pushes the rocket forward through space.
The momentum of the tractor or ATV can move the ramp backward away from the truck or trailer and cause it to drop to the ground. It is important to fasten the ramp to the truck (for example, with anchor chains or a locking lug on the flap to prevent the ramp from coming off the truck or trailer bed.