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Force plays a crucial role in changing momentum by causing an object to accelerate or decelerate.

In physics, momentum is defined as the product of an object's mass and its velocity. It is a vector quantity, meaning it has both magnitude and direction. The role of force in changing momentum is governed by Newton's second law of motion, which states that the rate of change of momentum of an object is directly proportional to the force applied and occurs in the direction in which the force is applied.

When a force is applied to an object, it causes the object to accelerate (increase its velocity) or decelerate (decrease its velocity). This change in velocity, in turn, changes the object's momentum. If the force is applied in the same direction as the object's motion, it increases the object's momentum. If the force is applied in the opposite direction, it decreases the object's momentum.

For example, if you push a stationary car, you are applying a force to it. This force causes the car to accelerate and thus gain momentum. If you then apply a force in the opposite direction (by applying the brakes, for instance), the car decelerates and its momentum decreases.

It's also important to note that the greater the force applied, the greater the change in momentum. Similarly, the longer the force is applied, the greater the change in momentum. This is because the change in momentum is equal to the force applied multiplied by the time for which it is applied, a concept known as impulse.

In summary, force is the key factor that causes changes in an object's momentum. By applying force, we can control the speed and direction of an object, thereby controlling its momentum.

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