Question 17
A bicycle allows you to travel using less work. What kind of simple machine is it?

Image: GT1976, own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=70078677

Image: GT1976, own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=70078677