Question

just like we did in lab 5.3, determine the flow of energy in this situation.
a second - grader eats wheaties for breakfast. then, at recess, he pushes the merry - go - round for his friends and breaks a sweat.
(there is an image showing a wheaties box and a child pushing a merry - go - round with another child on it. below the image, there is a table with action column having entries: chewing, digestion, pushing the merry - go - round, sweating and type of energy column with dropdowns for each action.)

Explanation:

Step1: Analyze Chewing

Chewing involves mechanical movement of jaws, so the energy type is Mechanical Energy (or Kinetic Energy related to motion).

Step2: Analyze Digestion

Digestion is a biochemical process where food (chemical energy in Wheaties) is broken down, converting Chemical Energy to other forms (like ATP, a chemical energy carrier). So energy type: Chemical Energy (conversion, but the main input is Chemical from food).

Step3: Analyze Pushing Merry - go - round

Pushing the merry - go - round involves applying force to move it, so the energy used by the boy is converted to the kinetic energy of the merry - go - round. The boy's body uses Chemical Energy (from digestion) to do mechanical work, so the energy for pushing is Mechanical Energy (output from the boy's action, converting chemical to mechanical).

Step4: Analyze Sweating

Sweating is a process where the body releases heat (to cool down), so the energy type is Thermal Energy (Heat Energy). The body's internal processes (using chemical energy) produce heat, which is released as thermal energy.

Answer:

• Chewing: Mechanical Energy (Kinetic Energy of jaw movement)
• Digestion: Chemical Energy (from food, converted during digestion)
• Pushing the merry - go - round: Mechanical Energy (kinetic energy of the merry - go - round, from the boy's mechanical work)
• Sweating: Thermal Energy (Heat Energy released by the body)