Question

A man eats glucose and then he pushes a block to move, which then comes to rest after sliding on a rough floor. The correct order of energy changes can be:

• A. Chemical energy $\to$ Heat energy $\to$ Kinetic energy
• B. Chemical energy $\to$ Kinetic energy $\to$ Heat energy
• C. Heat energy $\to$ Kinetic energy $\to$ Chemical energy
• D. Kinetic energy $\to$ Chemical energy $\to$ Heat energy

Answer 1

The correct option is B Chemical energy $\to$ Kinetic energy $\to$ Heat energy

The man got energy by the digestion of glucose. Digestion of food is a chemical change. This energy is then transformed into kinetic energy as he pushes the block to move. As the block slides on a rough floor, it would eventually come to rest due to friction. Friction produces heat. So the correct order of energy change is:
Chemical energy $\to$ Kinetic energy $\to$ Heat energy.