Washing method

1. A method for washing laundry comprising:

(a) sensing weight of the laundry; and

(b) based on the sensed weight of the laundry, performing a first wetting of the laundry or a second wetting of the laundry,

wherein the first wetting of the laundry is performed when the sensed weight of the laundry is equal to or greater than a predetermined reference value,

the first wetting of the laundry comprising:

rotating a drum in a first direction at a first speed such that laundry is lifted to a predetermined height of the drum and falls below the predetermined height once the laundry reaches the predetermined height;

accelerating the drum from the first speed to a second speed to rotate the drum at the second speed such that at least some of the laundry clings to a side of the drum for a full rotation of the drum; and

spraying wash water into the drum during rotation of the drum at the second speed,

wherein the second wetting of the laundry is performed when the sensed weight of the laundry is less than the predetermined reference value,

the second wetting of the laundry comprising:

rotating the drum in the first direction at the first speed such that laundry is lifted to the predetermined height of the drum and falls below the predetermined height once the laundry reaches the predetermined height; and

spraying wash water into the drum during rotation of the drum at the first speed.

2. The method according to claim 1 , wherein the rotating of the drum at the first speed comprises rotating the drum such that the laundry is lifted from a lowest position of the drum and then falls from the predetermined height of the drum.

3. The method according to claim 2 , wherein the rotating of the drum at the first speed comprises rotating the drum such that the laundry falls from lower than half the height of the drum.

4. The method according to claim 1 , wherein the spraying of the wash water into the drum during rotation of the drum at the second speed is carried out in a latter half of the accelerating of the drum.

5. The method according to claim 1 , the first wetting of the laundry comprising:

braking the drum rotated at the second speed, wherein

the rotating of the drum, the accelerating of the drum, and the spraying of the wash water in the first wetting of the laundry are repeated after the drum is braked.

6. The method according to claim 1 , wherein the spraying of the wash water into the drum during rotation of the drum at the second speed comprises spraying wash water supplied from an external water source into the drum.

7. The method according to claim 1 , wherein the spraying of the wash water into the drum during rotation of the drum at the second speed comprises spraying wash water recycled from the drum.

8. The method according to claim 1 , further comprising:

changing of the rotation of the drum from the first direction to a second direction, which is opposite of the first direction and alternating a rotational direction of the drum between the first and second directions, wherein

the accelerating of the drum is carried out after the changing of the rotation the drum from the first direction to the second direction.

9. The method according to claim 8 , wherein the changing of the rotation of the drum from the first direction to the second direction comprises supplying wash water having detergent dissolved therein into a tub such that at least a portion of the drum is filled with the wash water.

10. The method according to claim 1 , wherein the first wetting of the laundry is performed when wash water having detergent dissolved therein is provided into a tub and at least a portion of the drum is filled with the wash water.

11. The method according to claim 1 , wherein another some of the laundry tumbles inside the drum in the accelerating of the drum from the first speed to the second speed.

12. A method for washing laundry comprising:

(a) sensing weight of the laundry; and

(b) determining to perform a normal load laundry wetting or a heavy load laundry wetting based on the sensed weight of the laundry, wherein

the normal load laundry wetting is performed according to the determination that the sensed weight of the laundry is less than a predetermined reference value, and the heavy load laundry wetting is performed according to the determination that the sensed weight of the laundry is equal to or greater than the predetermined reference value, wherein

the normal load laundry wetting comprises:

rotating a drum in a first direction at a first speed such that laundry is lifted to a predetermined height of the drum and falls below the predetermined height once the laundry reaches the predetermined height; and

spraying wash water into the drum during rotation of the drum at the first speed,

wherein the heavy load laundry wetting comprises:

rotating the drum in the first direction at the first speed such that laundry is lifted to the predetermined height of the drum and falls below the predetermined height once the laundry reaches the predetermined height;

accelerating the drum from the first speed to a second speed to rotate the drum at the second speed such that at least some of the laundry clings to a side of the drum for a full rotation of the drum; and

spraying wash water into the drum during rotation of the drum at the second speed.