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Showing content from https://docs.unity3d.com/Manual/../ScriptReference/Rigidbody.AddForce.html below:

Unity - Scripting API: Rigidbody.AddForce

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Switch to Manual Declaration

public void

AddForce

(

Vector3 force

ForceMode mode

= ForceMode.Force);

Parameters Parameter Description force Force vector in world coordinates. mode Type of force to apply.

Force is applied continuously along the direction of the force vector. Specifying the ForceMode mode allows the type of force to be changed to an Acceleration, Impulse or Velocity Change.

The effects of the forces applied with this function are accumulated at the time of the call. The physics system applies the effects during the next simulation run (either after FixedUpdate, or when the script explicitly calls the Physics.Simulate method). Because this function has different modes, the physics system only accumulates the resulting velocity change, not the passed force values. Assuming deltaTime (DT) is equal to the simulation step length (Time.fixedDeltaTime), and mass is equal to the mass of the Rigidbody the force is being applied to, here is how the velocity change is calculated for all the modes:

ForceMode.Force: Interprets the input as force (measured in Newtons), and changes the velocity by the value of force * DT / mass. The effect depends on the simulation step length and the mass of the body.
ForceMode.Acceleration: Interprets the parameter as acceleration (measured in meters per second squared), and changes the velocity by the value of force * DT. The effect depends on the simulation step length but doesn't depend on the mass of the body.
ForceMode.Impulse: Interprets the parameter as an impulse (measured in newton-seconds), and changes the velocity by the value of force / mass. The effect depends on the mass of the body but doesn't depend on the simulation step length.
ForceMode.VelocityChange: Interprets the parameter as a direct velocity change (measured in meters per second), and changes the velocity by the value of force. The effect doesn't depend on the mass of the body or the simulation step length.

Force can only be applied to an active Rigidbody. If a GameObject is inactive, AddForce has no effect. Also, the Rigidbody cannot be kinematic.

By default the Rigidbody's state is set to awake once a force is applied, unless the force is Vector3.zero.

Additional resources: AddForceAtPosition, AddRelativeForce, AddTorque.

This example applies a forward force to the GameObject's Rigidbody.

Declaration

public void

AddForce

(float

x

, float

y

, float

z

ForceMode mode

= ForceMode.Force);

Parameters Parameter Description x Size of force along the world x-axis. y Size of force along the world y-axis. z Size of force along the world z-axis. mode Type of force to apply.

This example applies an Impulse force along the Z axis to the GameObject's Rigidbody.

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