Possible answers:
i. vehicles.
ii. brake pad.
iii. humans.
iv. animals.
v. people.
vi. gas pedal.
vii. pistons.
viii. seatbelt.
Q: Fact 1: An automobile engine transforms chemical energy into mechanical energy. Fact 2: Engines convert some energy of it to move the pistons (to work). Given the two facts above, what is moved by mechanical energy in an automobile?
A:
vii.