Make Player stronger than Object

a oject in my game pushes the player around if the collide, so it is stronger. how can change this to the opposite that the player pushes the oject around?
thank you!

just increase the weight of the player with respect to the other game object.

Or you can also freeze the position of the player in any direction and can restrict it rotation
http://docs.unity3d.com/Documentation/ScriptReference/Rigidbody-constraints.html