Yes, an object with a non-zero force acting on it can move at a constant speed in a straight line. This might seem counterintuitive, but it's possible if there's another force acting on the object that perfectly balances the first force.

Here's why:

* Newton's First Law: An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net force.

* Net Force: The net force is the vector sum of all forces acting on an object.

* Equilibrium: If the net force on an object is zero, then the object is in equilibrium. This means its velocity is constant (either at rest or moving at a constant speed in a straight line).

Example:

Imagine you're pushing a heavy box across a floor. You're applying a force to the box, but it's moving at a constant speed. This is because friction between the box and the floor is applying an equal and opposite force to your push. The two forces cancel each other out, resulting in a net force of zero, allowing the box to move at a constant speed.

Key Points:

* Non-zero force does not necessarily mean acceleration: The object will only accelerate if the net force acting on it is non-zero.

* Constant speed does not mean no forces: It just means the forces are balanced.

Let me know if you'd like to explore any other physics concepts!