Straws and Flow

Think about your experiences drinking with straws. You are drinking a drink through a straw.

• Is it easier or harder to drink through the straw as the straw gets narrower?
• Is is easier or harder to dring through a straw if the straw gets longer?

Express your thoughts as a proportionality relationship for resistance to flow in terms of the cross sectional area A and the length L. The larger the resistance, the harder it is to get fluid to flow.