1. subject to the power to go against strong resistance. 2. the friction causing heat.3. we need to try to reduce the friction by lubricating parts to use or move easily.4. friction performance of the engine to work decreased.
1. Must be a waste of energy to clear the resistance 2. The friction causes heat three. We must try to reduce the friction by lubricating the parts to be used for mobility or four. Friction causes reduced engine performance.