Final answer:
In Physics, thrust, gravity, and friction are forces that affect the motion of objects, whereas acceleration is a result of force applied and not a force itself.
Step-by-step explanation:
In the study of Physics, different kinds of forces are important concepts when discussing motion and interaction between objects. Among the forces you've listed, thrust, gravity, and friction are all forces that can influence the movement and position of objects. However, acceleration is not a force; rather, it is a result of a net force applied to an object and represents the rate of change of an object's velocity. Thrust, specifically, is a reaction force that pushes a body forward, such as rockets, airplanes, and cars being pushed by a thrust reaction force. Gravity is the force of attraction between masses, and friction is the force that opposes the sliding motion between two surfaces that are in contact.