The acceleration produced by a net force on an object is directly proportional to the magnitude of the net force, is in the same direction as the net force, and is inversely proportional to the mass of the object.

F=ma
To give the more general case, we could say that the net force is directly proportional to the time rate change of momentum:

F=dp/dt = d(mv)/dt

When m (mass) is constant this reduces to the famous F=ma. But often (think rocketry for example), mass is not constant.

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