1. How does the chain drive cause a bicycle to move forward? 2. When a biker is riding up a hill, they need more torque. To accomplish this, they can change the size of the sprockets that they are using. Should the sprocket on the driving gear be smaller, larger, or the same size as the driven gear? Explain your reasoning. Submit Assignment

1. The chain drive transfers the rider’s pedaling energy to the rear wheel. When you pedal, you turn the chainring (the driving sprocket), which pulls the chain. The chain then rotates the rear sprocket (the driven gear) attached to the rear wheel. As the rear sprocket turns, it spins the wheel, pushing the bicycle forward. This chain connection allows the rider’s muscular force to be efficiently converted into rotational motion at the wheel, which then interacts with the ground to produce forward motion. 2. When riding uphill and needing more torque (i.e., a stronger pulling force but at lower speeds), the biker should use a smaller sprocket on the driving gear (the pedals) and a larger sprocket on the driven gear (the rear wheel). This setup creates a lower gear ratio, which means that for every turn of the pedals, the rear wheel turns less than it would with a higher gear ratio. The trade-off is that while the bicycle moves slower, the torque delivered to the rear wheel is increased, making it easier to overcome the force of gravity on a hill. A lower gear ratio increases the mechanical advantage, allowing the rider to pedal with less force to maintain motion uphill.