We know that a key factor in successful learning is a learner’s motivation. Everyone also agrees that a key factor in effective teaching is an instructor’s ability to facilitate student motivation, particularly in circumstances where children are not inherently interested in learning. We should come to notice that there is no border among different sciences and students can learn chemistry, physics, biology,… simultaneously. A number of theoretical explanations of motivation have been developed which are of considerable assistance to teachers and instructors in trying to understand the nature of motivation and the dynamics of the motivational process in learning environments.