Question #48b19 Physics Work and Energy Simple Machines 1 Answer Atika Khan Sep 13, 2016 wedge lever pulley Answer link Related questions What is a lever? What is a pulley? How do a wheel and axle work? Why are simple machines not 100% efficient? Why is a fork a wedge? Why is a knife a wedge? Why is a ladder an inclined plane? Why is a zipper a simple machine? Why were simple machines invented? Question #8e654 See all questions in Simple Machines Impact of this question 1865 views around the world You can reuse this answer Creative Commons License