The performance and interest in physics and physics education over the years have not been encouraging. It is for this reason that the study was conducted to find students interest in physics theory as a result of physics practical. The aim of the study was to identify the relationship between physics practical achievementand physics theory achievement at the tertiary level. The study employed secondary data spanning five academic years for analysis and the results communicated in the studies. The results revealed that, practical physics correlated positively with practical theory achievement scores with a Pearson correlation of r=0.519, p<0.001. It was also shown that physics practical reports write-up was negatively correlated with physics practical exams with Pearson correlation of r=-0.219, p<0.001. In conclusion, it can be said that practical physics has a positive effect on physics theory at the tertiary level. Key Points: Physics

Keywords: Practical, Physics Theory, Learning outcomes, Science Education