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# Force and acceleration – Can force be exerted without acceleration?

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I am not able to understand this and I couldn’t think of a better example. i repeat. its just an example. if i punch someone’s face with my arm having constant velocity, it will mean that the acceleration of my arm is zero. F=ma, therefore force exerted by my arm is zero. Now if the force applied is zero the why does the person whom i punched experiences pain….. please help… thanks…

It’s not whether your hand is moving with constant velocity, bu what happens to your hand after hitting the face of the opponent. The face resists the motion of your hand the momentum of your hand is imparted/shared to the face. And there is (-)acceleration to the hand and causes a force to be exerted on the face. The momentum imparted to the face will be responsible for the damage caused.

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