Does adding a rock to a shoe in the drag lab add mass or weight?

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Mike Powell
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I am teaching 7th grade Science.

We are doing the shoe drag lab. To start we drag a shoe across the floor with a rubber band. Then we add a rock to the shoe and drag it again, measuring the stretch of the rubber band with a ruler.
My question is: by adding a rock to the shoe, are we adding mass or weight?

Mike

P.S. Please help, I have to know the answer before tomorrow morning.
 
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Which increases its weight.

EDIT -- Quiz Question: Why?

(hint: What equation relates mass to the force of weight?)