When a system does work, what happens to its internal energy

Internal energy decreases

Explanation:

According to first law of thermodynamics heat can neither be created nor destroyed , but it changes from one form to another form.

Mathematical representation :

U=Q-w

Where U=Internal energy of system

w=Work done

Q=Heat gain or removed

When system does work then it take positive .When system does work then Q is positive .

Hence, the internal energy will decrease .

f=ma a/f/m a= 480/60 a = 8m/s/s that is quick wow

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible