noun

impulse

IM-puls/ˈɪmpʌls/

A brief push that sets something into motion.

A quick flick gives the ball an impulse.

A finger flicks a red ball, which rolls away after the brief push.

Etymology

A push against something became a figurative incitement to act. An impulse is this push understood inwardly: a feeling that suddenly urges someone toward action.

In context

Fact Feast18:35

with a sudden impulse she laid her gloved hand lightly on the yellow head

Victorian Street Children (Hungry and Homeless Kids in the 19th Century)

More examples

Each impulse from the motor turns the wheel a little.
The collision delivers an impulse that sends the puck backward.
Repeated impulses keep the pendulum swinging.

Forms

impulse · impulses

Similar words

push: A push can be sustained; an impulse is brief.
jolt: Jolt emphasizes a sudden, sharp movement or impact.
thrust: Thrust often continues steadily rather than acting briefly.