Slow engine RPM is the main reason a car may be sluggish while accelerating. However, it also could be due to the oil.
Lack of propulsion.
it could be the starter motor getting lazy
Many things can cause a car to be sluggish like dirty air filter, check engine light came on, bad transmission, bad engine, etc.
impala sluggish after second gear
Cylinder miss.
Bad speed sensors can cause the car to hesitate when accelerating at speeds below 20 mph. The blockage of the air filters can also cause the car to hesitate when accelerating at speeds below 20 mph.
bad wheel bearings
Bad injectors,low fuel pressure, restricted air flow.
sounds like a cv joint
Possibly a loose heat shield or other component.
Normally a bent wheel or tire out of balance.
An accelerating force is the force which causes accelerated motion.