1. What is the difference between a simple and a complex machine?
2. What improvements have been made to bicycle designs over the last century?
3. Your body is made up of several simple machines that help you move. Identify a part of your body that acts as a simple machine. Identify the kind of machine it is and explain what it does; and what parts of your body act as linkages?
4. Picture yourself riding a bicycle in a race. Describe how energy is transferred from your body to the bicycle wheels.
5. What are gears? How are they used?