Yes, friction does slow down a moving object. Friction is the force that opposes the motion of two surfaces in contact with each other. When an object is in motion, it experiences frictional forces that act in the opposite direction to its motion, thus reducing its speed.
There are several ways to prove that friction slows down a moving object. Here are a few examples:
Experimental Evidence: Conducting experiments where the effect of friction on motion is observed directly can provide evidence. For instance, you can roll a ball on a smooth surface and measure the distance it travels. Then, repeat the experiment on a rough surface. You will find that the ball travels a shorter distance on the rough surface due to the frictional forces acting upon it.
Mathematical Analysis: Frictional forces can be described mathematically using equations. One such equation is the equation of motion, which states that the net force acting on an object is equal to its mass multiplied by its acceleration (F = ma). When friction is present, it acts as a force opposing the motion and reduces the acceleration of the object. Consequently, the object slows down.
Real-World Examples: Observing everyday situations can also illustrate the effect of friction on slowing down objects. For example, when a car applies its brakes, the friction between the brake pads and the wheels slows down the vehicle. Similarly, when you slide a book on a table, it eventually comes to a stop due to the friction between the book and the table's surface.
These examples and others provide empirical and theoretical evidence that supports the statement that friction slows down a moving object.