ANSWER:

• 1. Gravity

• 2. Friction

• 3. Force

• 4. Motion

• 5. Drag Force

• 6. Viscosity

• 7. Energy

• 8. Potential Energy

• 9. Mechanical Energy

• 10. Kinetic Energy

• 11. Chemical Energy

• 12. Radiant Energy

• 13. Electric Current

• 14. Sound Energy

• 15. Thermal Energy