More cards in this set

Card 6

Front

What eventually happens to wasted energy?

Back

Preview of the front of card 6

Card 7

Front

Does energy become less useful after we use it?

Back

Preview of the front of card 7

Card 8

Front

How efficient can a machine be?

Back

Preview of the front of card 8

Card 9

Front

How can we make machines more efficient?

Back

Preview of the front of card 9