Placing pieces by placing a separate distribution away from each other as much as they can be apart, the weight of the floors that receive the 15 kg by weight is distributed load.
Placing the specimen by placing the distribution of separate apart as they can be. The weight of the floor and then get up to 15 kg by weight of a load.
Placing the workpiece by placing the spread apart as far as it can be far apart. The weight of the floor is that the 15 kg. The weight is distributed load.