An object that is accelerating is either speeding up or slowing down. If the acceleration is in the same direction as the velocity, the object is speeding up. If the acceleration is opposite to the velocity, the object is slowing down.
-- speeding up -- slowing down -- curving
acceleration is changes in speed slowing down and speeding up.
When an object is speeding up or slowing down, it is experiencing acceleration. When it is turning, it is undergoing rotation or changing direction.
Slowing down and Speeding up
Acceleration refers to the rate of change of an object's velocity, which can include both speeding up and slowing down. When an object accelerates, it can increase or decrease its speed depending on whether the acceleration is in the same direction as the velocity (speeding up) or in the opposite direction (slowing down).
Speeding up, slowing down, and turning.
When it is stationary, or when the velocity is constant. If it is speeding up or slowing down, it has acceleration.
changing direction, speeding up, and slowing down
Positive is speeding up and negative is slowing down
Positive acceleration = speeding up. Negative acceleration = slowing down.
Take the component of the acceleration along the direction the object is moving. If this component is positive (the acceleration vector, or the relevant component, points in the same direction as the movement), then the object is speeding up.