1. Change in Speed: Unbalanced forces cause an object to speed up or slow down.
* Example: A car accelerating from a stoplight experiences an unbalanced force from the engine, causing its speed to increase.
* Example: A ball thrown upwards slows down as the force of gravity pulls it back to Earth, decreasing its speed.
2. Change in Direction: Unbalanced forces can cause an object to change its direction of motion.
* Example: A soccer ball kicked to the right experiences an unbalanced force from the kick, causing it to change direction.
* Example: A satellite in orbit around Earth constantly changes direction due to the unbalanced gravitational force pulling it towards the planet.
3. Change in Both Speed and Direction: The most common scenario is that unbalanced forces result in changes to both speed and direction.
* Example: A baseball hit by a bat experiences a significant change in both speed and direction, due to the unbalanced force of the bat.
* Example: A car turning a corner experiences an unbalanced force (from friction between tires and road) that causes both a change in speed (it might slow down slightly) and a change in direction.
Key Point: The net force, which is the sum of all forces acting on an object, determines how its velocity changes. If the forces are balanced, the net force is zero, and the object's velocity remains constant. If the forces are unbalanced, the net force is non-zero, and the object's velocity will change.
