In Christian theology, synergism is the belief that salvation involves some form of cooperation between divine grace and human freedom. Synergism is upheld by the Catholic Church, Eastern Orthodox Churches, Oriental Orthodox Churches, Anabaptist Churches and Methodist Churches. It is an integral part of Arminian theology common in the General Baptist and Methodist traditions.
Synergists compare God's role in salvation to Christ "standing at the door" (The Light of the World by William Holman Hunt).
Free will is the capacity or ability to choose between different possible courses of action.
A biker performing a dirt jump that, according to some interpretations, is the result of free will
A domino's movement is determined completely by laws of physics.
René Descartes
Thomas Hobbes was a classical compatibilist.