A constant force is a force that remains the same in magnitude and direction over time. This means that the force does not change, allowing for predictable motion of an object. For example, if a car is pushed with a constant force, it will accelerate uniformly, making it easier to calculate its speed and distance traveled. In physics, constant force is often represented by Newton's second law, which states that force equals mass times acceleration (F = ma). This relationship helps us understand how objects respond to forces, whether they are in motion or at rest, and is fundamental in studying mechanics.