* 10 pounds and 10 kilograms: These are units of mass, not force. To compare them as forces, we'd need to convert them to units of force like Newtons.

* Newtons: This is the standard unit of force.

Conversion:

* 1 pound ≈ 4.45 Newtons

* 1 kilogram ≈ 9.81 Newtons

Calculations:

* 10 pounds ≈ 10 * 4.45 Newtons ≈ 44.5 Newtons

* 10 kilograms ≈ 10 * 9.81 Newtons ≈ 98.1 Newtons

Therefore:

* 50 Newtons is the greatest force.

* 10 kilograms is the second greatest force.

* 10 pounds is the smallest force.