impulse

衝動

よく考えずに何かをしたくなる、突然の強い気持ち。

やさしい英語で： 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?

使い方： an impulse to do something (I felt an impulse to call her.); on impulse (She bought the shoes on impulse.)

類義語： urge, desire

よく使う表現： on impulse, sudden impulse, resist an impulse, impulse to laugh

衝撃、押す力

物を動かす、突然の押す力や衝撃。

やさしい英語で： 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.

類義語： push, thrust

よく使う表現： sudden impulse, give an impulse, initial impulse

力積

力が作用する時間全体での効果。物体の運動量の変化で表される。

やさしい英語で： 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.

よく使う表現： total impulse, calculate the impulse, impulse of force