21. The power steering use an electric motor instead of mechanical energy delivered by fan belts. 22. Their natural movement would push the disc around, turning a shaft and generating mechanical energy . 23. Through these convection motions, heat energy from the core is converted efficiently into mechanical energy . 24. This force moves the component over a distance, transforming chemical energy into useful mechanical energy . 25. Electric motors, when used in reverse function as generators, convert mechanical energy into electrical energy. 26. At stop signs, downshifting engaged the electric motor in recharge mode, recapturing the mechanical energy . 27. This process turns mechanical energy into electric energy. 28. In this question, mechanical energy is not conserved. 29. Internal forces might convert Mechanical energy into heat. 30. All helmets attempt to protect the user's head by absorbing mechanical energy and protecting against penetration.