1. Change in Speed:
* Acceleration: This means the object is speeding up. A positive acceleration increases the object's speed.
* Deceleration: This means the object is slowing down. A negative acceleration decreases the object's speed.
2. Change in Direction:
* Turning: Even if the object maintains a constant speed, changing direction means its velocity is changing. Velocity is a vector quantity, meaning it has both magnitude (speed) and direction.
Here's a breakdown of how these changes occur:
* Forces: The primary cause of changes in velocity is the application of forces.
* Net Force: If a net force acts on an object, it will cause the object to accelerate (change its velocity). This is described by Newton's Second Law of Motion (F = ma).
* Examples:
* Pushing a box: Applying a force to a box makes it move faster (acceleration).
* Braking a car: The brakes apply a force that slows the car down (deceleration).
* Turning a corner: A force is required to change the direction of the car, even if it maintains a constant speed.
In summary:
* Velocity changes when there is a change in speed, a change in direction, or both.
* Forces are the agents that cause these changes.
