According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that if the net force acting on an object increases, its acceleration will also increase; and if the net force acting on an object decreases, its acceleration will decrease.
The speed of an object is the rate at which it is moving. Acceleration is the rate at which the velocity of an object is changing. So, if the acceleration of an object changes, its speed will also change.
If an unbalanced force acts on an object in the same direction as its motion, it will cause the object to accelerate in that direction and its speed will increase. If an unbalanced force acts on an object in the opposite direction of its motion, it will cause the object to accelerate in that direction and its speed will decrease. If an unbalanced force acts on an object at a right angle to its motion, it will cause the object to accelerate in that direction and its speed will not change.
The amount of change in speed will depend on the magnitude of the unbalanced force and the mass of the object. A greater unbalanced force will cause a greater change in speed, and a smaller unbalanced force will cause a smaller change in speed. A more massive object will experience a smaller change in speed than a less massive object when the same unbalanced force is applied to both objects.
