Abstarct: Flotation is the most important method for the separation of minerals. A key element of recovering valuable minerals through flotation is particles/air bubbles interaction in water. In the present paper, an experimental approach is proposed to study the collision of fixed bubble and particles. The results of this investigation are widely used in the industrial applications. In this paper, by creating a bubble with a diameter of 5.5 mm, the plastic particles (with a diameter of 1.5, 2 and 2.5 mm) are released on the surface of the bubble. This study was performed at four height of release 16.39, 12.5, 10 and 4.4 mm from the bubble surface. The results show that the time and sliding velocity of the particles on the bubble surface are independent from the falling distance. The sliding velocity of the particles on the bubble surface is dependent on the falling height and increasing the height of release leads to a increase in the sliding velocity particles on the surface of the bubble. The polar position of the particles on the bubble surface is changed by variations of the falling height and increasing the height of release leads to a decrease in the polar position of collision on the surface of the bubble. The initial collision angles at the release heights of 16.39,12.5,10 and 4.55mm Respectively 15.15, 18.01, 18.8 and 21.3 degrees, respectively. In this study, the effect of forces of drag, capillary, pressure, weight and buoyancy on the attachment and detachment of the particle on the surface of the bubble has been reported. The effect of the three-phase contact line on the capillary and pressure forces are also analyzed. As the diameter of the particle increases, the Bond number of the instantaneous does not change much, so that for a particle with diameters of 1.5, 2 and 2.5 mm the Bond number is between 0.3 and 0.8 . Also, the increase in the height of release does not affect the number Bond, and for the four height of release of 16.39, 12.5, 10, and 4.55 mm, the Bond number of momentary fluctuates between 0.4-0.7.