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A Fast Falling Weight Deflectometer (FFWD) is a FWD with pneumatic or electric actuators rather than hydraulic, making the mechanics several times faster. A Heavy Weight Deflectometer (HWD) is a falling weight deflectometer that has higher loads (typically 300 kN to 600 kN), used primarily for testing airport pavements.
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Suppose you have two objects, one heavier (b) than the other (a). Suppose the heavier object falls faster. When you put the lighter object under the heavier object (c), the lighter object should slow down the heavier object. On the other hand gluing together both objects results in an heavier object (c), which should fall even faster than (b).
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