Rigidbody.AddForceAtPosition

Parameters

Description

Applies force at position. As a result this will apply a torque and force on the object.

For realistic effects position should be approximately in the range of the surface of the rigidbody. This is most commonly used for explosions. When applying explosions it is best to apply forces over several frames instead of just one. Note that when position is far away from the center of the rigidbody the applied torque will be unrealistically large.

Force can be applied only to an active rigidbody. If a GameObject is inactive, AddForceAtPosition has no effect.

Wakes up the Rigidbody by default. If the force size is zero then the Rigidbody will not be woken up.

For more information on how ForceMode affects velocity, see Rigidbody.AddForce.

Additional resources: AddForce, AddRelativeForce, AddTorque.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    void ApplyForce(Rigidbody body)
    {
        Vector3 direction = body.transform.position - transform.position;
        body.AddForceAtPosition(direction.normalized, transform.position);
    }
}