Physics is a natural science that engrosses study of space, matter, energy, force, motion and moreover it understands how the universe works. Likewise keeping this definition in mind u can work on projects like

1. Investigating the Mpemba Effect
Can Hot Water Freeze Faster than Cold Water?
2. Harmonic Motion in a Spring-Mass System
3. Measuring the Surface Tension of Water
4. Solid Motor Rocket Propulsion
5. How the Strength of a Magnet Varies with Temperature
6. Distance and Constant Acceleration
7. How Does Color Affect Heating by Absorption of Light?
8. Effect of Light on LDR
9. Classical Mechanics
10. Electromagnetic Induction
11. Relativistic Mechanics
12. Compare Strength of Wood using 3 different Paint's
13. Assemble your own telescope