Question

1. which examples best explain the importance of mechanical energy in our everyday lives? select two correct answers. mechanical energy helps - a. people smell candles. b. cars and buses move. c. traffic lights to change. d. machines work. e. streets to be smooth.

Explanation:

Mechanical energy is the sum of kinetic and potential energy in an object that is used to do work. For cars and buses to move, mechanical energy (in the form of kinetic energy) is required. Similarly, machines work because of the application of mechanical energy. Smelling candles is related to chemical and olfactory processes (not mechanical energy). Traffic lights changing is related to electrical energy (in most common cases). Streets being smooth is a property related to construction materials and processes (not directly mechanical energy in the sense of energy for work - doing as in the other correct options).

Answer:

B. cars and buses move, D. machines work