In the PhET activity, “Properties of Gases”, when volume is kept the same, as the temperature is increased, the rate of collisions increases.
Explanation:
Gases have following three characteristic properties:
(1) Can be compressed easily.
(2) The containers are to be filled by expanding.
(3) More space is occupied than the liquids or solids.
According to the Property of gases in the PhET activity, at constant volume when the temperature of a gases increases, the rate of collisions increases.