Does the direction of acceleration always coincide with the direction of speed? Give an example.

The directions of the vectors of velocity and acceleration coincide only if the body is moving with acceleration in a straight line. At the same time, the speed of movement increases.

If the body moves in a straight line, but with decreasing speed, the directions of the vectors of speed and acceleration are opposite.

With a curvilinear trajectory of the body, these vectors do not coincide. The velocity vector will be directed tangentially to the trajectory, and the acceleration vector will be determined by two components: normal and tangential.

Tangential determines the change in speed in absolute value and is directed tangentially to the trajectory.

Normal defines how the directional speed changes and is directed along the normal to the trajectory.