To find acceleration when only given a horizontal force (Fx) at a 25-degree angle, it is essential to clarify that the force is acting on an object, not being pulled itself. The force can be broken down into horizontal (Fx) and vertical (Fy) components, with Fy calculated as Fy = Fx(tan(25)). To determine acceleration, the mass of the object must also be known. The relationship between force, mass, and acceleration is governed by Newton's second law, which states that acceleration equals force divided by mass. Understanding these components is crucial for accurately calculating acceleration.