Concentration

When you increase the Concentration in a certain volume so does the frequency of collisions. This is because there are more particles in a certain volume so there is more chance of them colliding with each other than a reaction with lower concentration. All of this amounts to an increase in the rate of reaction.

Surface Area

When you increase the Surface Area of the reactants you also increase the frequency of collisions. This is because when the reactants are solids the particles will  only be able to collide with them at the sides of the solid. However if you broke the solid up into pieces there would be more places for the particles to collide with, like in between the solid particles. All of this amounts to an increase in the rate of reaction.

Temperature

When you in the Temperature of the reactants you also increase the frequency of collisions. This is because the temperature increases the particles kinetic energy. This means that the particles move around quicker than particles at low temperature. It also means that there is a greater amount of successful collisions as the particles will have more activation energy when they collide with the reactants. All of this amounts to an increase in the rate of reaction.

Adding A Catalyst

If you added a catalyst to the reaction then you will also make more successful collisions. This is because the catalysts provide a different route for the reactions that have lower activation energy. All of this amounts to an increase in the rate of reaction.