A moving train (target) disappeared behind a block and subjects were to predict when the target passed on a marker on the block. Three samples of subjects: nursery school children, second-grade primary school children, and university students were asked to participate in the experiment. Analysis of the results shows that the perception of constant velocity and acceleration of university students was direct and accurate, but in both groups of children perception was found to be inaccurate when the target moved with acceleration. It was therefore supposed that the concept of acceleration was lacking in children. It was however found that the perception became accurate after instructions on acceleration were given. It was supposed that children acquired the concept of acceleration only after being instructed. This shows that the concept of acceleration may be formed through instruction.