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Question by JonathanO · Feb 15, 2013 at 03:33 PM · velocityacceleration

Move Cube With Force and slow it down

I want to create an impulse force on an object and track its speed.

 if (Input.GetKeyDown(KeyCode.UpArrow))
     {
         
         var relativeForce = new Vector3(0, 0,-100);
         rigidbody.AddForce(relativeForce, ForceMode.Acceleration);
     }

This Moves my cube forward but it moves and stops almost immediatly.

I want the velocity of the cube to have a bell curve effect. Ie: slowly starts increasing in speed to a maximum speed and then slows down to zero speed.

I have tried adding a frictional force to counteract the object movement but it seems to to get applied.

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avatar image GerryM · Feb 15, 2013 at 04:44 PM 0
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Did you try to play with the drag value for the rigidbody?

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Answer by robertbu · Feb 15, 2013 at 05:00 PM

To get something that slowly increases speed, you will need to add a bit of force over a number of frames rather than a single force. Take a look at the Component/Physics/Constant Force component. You can turn it on and off. As for slowing, play with Rigidbody.drag.

I'm unsure of why your object slows to a stop almost immediately. Is there friction? Is it resting on a surface?

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avatar image JonathanO · Feb 15, 2013 at 08:35 PM 0
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You are right. This works. I had a problem that was unrelated. I see now that drag works perfectly for what I had wanted.

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