The four forces are...
Applied force: a applied force is a contact force and the abriviation is Fapp. This force is a push or pull that is called by you.
Gravitional force: a gravitional force is the only force that is a non contact force meaning there is no need for you or anything else to touch an object to make it move. So the object is attracting it self to two objects.
Normal force: Normal force is a object that just sits there but the force is pulling it usually to a flat surface.
Finally...
Tension force: tension force is a force that needs string or rope in order to make an object move.
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