impulse / momentum
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impulse
A sudden inner drive or urge to do something, often without much thought. It can also refer to an external stimulus or inspiration that triggers an action or thought.
Aus einem Impuls heraus kaufte sie das teure Kleid.
On impulse, she bought the expensive dress.
You can recognize the meaning of 'Impuls' from the context. If it is about feelings or spontaneous actions, the psychological meaning is intended. In texts about physics or technology, the technical meanings are intended.
Sie hatte den plötzlichen Impuls, alles stehen und liegen zu lassen.
She had the sudden impulse to drop everything.
In the psychological meaning, 'Impuls' (impulse) is often combined with certain verbs. Typical phrases are 'einem Impuls folgen' (to follow an impulse), 'einen Impuls verspüren' (to feel an impulse), or 'aus einem Impuls heraus' (on impulse).
Er folgte dem Impuls und rief sie sofort an.
He followed the impulse and called her immediately.
In physics, 'der Impuls' (momentum) is a precisely defined technical term. It is used whenever the movement and mass of objects in a physical system are involved.
Die Erhaltung des Impulses ist ein wichtiges Prinzip in der Mechanik.
The conservation of momentum is an important principle in mechanics.
In electrical engineering and computer science, 'Impuls' (pulse / impulse) refers to a short signal. You often find the word in contexts such as signal processing, data transmission, or control engineering.
Ein digitaler Impuls kann den Zustand '0' oder '1' repräsentieren.
A digital pulse can represent the state '0' or '1'.
initiative
'die Initiative' and 'der Impuls' can both be the beginning of an action. 'Impuls' often means a brief inner drive or an external stimulus. It can come suddenly and does not yet have to lead to a plan. 'Initiative' is more concrete: someone becomes active and takes the first step or takes responsibility. An impulse can therefore be the reason why someone shows initiative. If you only mean the brief push in someone's mind or from outside, 'Impuls' fits. If someone really acts and starts something, 'Initiative' is a better fit.
Der Impuls zum Aufräumen kommt Max, als er Besuch erwartet.
Max gets the impulse to tidy up when he is expecting visitors.
Nach dem Gespräch ergreift sie die Initiative und ruft sofort die Ärztin an.
After the conversation, she takes the initiative and calls the doctor immediately.