The acceleration due to gravity on the moon is 1.67m/s. What does it mean?

It actually is 1.67 m/s/s which means that if you are falling, the moon gravity will increase your falling velocity by 1.67 m/s every second.

If you are falling on the moon from a height. The speed at which you will be falling will increase by 1.67 m/s every second

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.