impulse

impulsion, envie

Envie forte et soudaine de faire quelque chose, souvent sans réfléchir d’abord.

En anglais simple : A sudden strong wish to do something, often without thinking first.

• I bought it on impulse.
• He resisted the impulse to shout.
• Do you ever act on sudden impulses?

Comment l'utiliser : an impulse to do something (I felt an impulse to call her.); on impulse (She bought the shoes on impulse.)

Synonymes : urge, desire

Expressions courantes : on impulse, sudden impulse, resist an impulse, impulse to laugh

impulsion, poussée

Poussée ou force soudaine qui fait bouger quelque chose.

En anglais simple : A sudden push or force that makes something move.

• A sudden impulse moved the ball.
• The first impulse sent the wheel spinning.
• Each blow gave the object another impulse.

Synonymes : push, thrust

Expressions courantes : sudden impulse, give an impulse, initial impulse

impulsion

Effet total d’une force pendant sa durée d’action, mesuré par la variation de la quantité de mouvement.

En anglais simple : The total effect of a force acting over time, measured by the change it causes in an object's momentum.

• Calculate the impulse during the collision.
• A longer contact time can increase the impulse.
• The impulse equals the change in the ball's momentum.

Expressions courantes : total impulse, calculate the impulse, impulse of force