Acceleration

Tips:

Constant speed means that the speed has the same value all over the track. The constant velocity indicates a constant magnitude AND direction all over the track.

When the value of the speed changes, increasing or decreasing, this means acceleration. Sometimes, the decrease of the speed value is denoted as deceleration.

Meanwhile, if the magnitude or direction of the velocity changes, this indicates an acceleration. In one dimension, the reverse of the direction of motion indicates an acceleration, even though the magnitude of the velocity is the same in both directions.

The speedometer, right in the above image, indicates the change in the vehicle speed. The meter to the left indicates the motor rotation level, in revolution per minute. The motor speed is transmitted to the wheels to move the vehicle. This change in speed is the acceleration.

The ant and the ball started from rest. The and is walking with a constant speed, and as a living body, it is controlling the motion to keep a constant speed. Meanwhile the ball is rolling down under the action of gravity. This gives the ball an increase in the speed every second. Notice the position of each of them in every second.