No, you don't need a force to keep a body moving with uniform velocity. This is due to Newton's First Law of Motion, also known as the Law of Inertia.

Here's why:

* Inertia: Objects tend to resist changes in their state of motion. If an object is at rest, it wants to stay at rest. If an object is moving, it wants to keep moving at the same speed and in the same direction.

* Uniform Velocity: Uniform velocity means constant speed and constant direction.

* Forces: Forces are pushes or pulls that can change an object's velocity (speed or direction).

In Summary: If a body is moving at a uniform velocity, it means there is no net force acting on it. The forces are balanced, so the object continues moving at the same speed and in the same direction without any additional force needed.

Example: Imagine a spaceship traveling through space far away from any gravitational influence. Once the spaceship reaches a certain speed, it will continue moving at that speed and in the same direction without any need for additional thrust from its engines.