Question Rearward amplification refers to: Answers The amount of noise projected to the rear of the vehicle. The cause of the "crack-the-whip" effect. The number of trailers that can be pulled by one tractor. Explanation The "crack-the-whip" effect is a result of rearward amplification. If not properly handled, a trailer can tip over due to rearward amplification. Take a FREE Practice Test Now This questions appears in the following tests: Missouri Double , Idaho Combination , Vermont Combination ,