Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Friction is the force that opposes motion between any surfaces that are in contact. There are four types of friction: static, sliding, rolling, and fluid friction. Static, sliding, and rolling friction occur between solid surfaces. Fluid friction occurs in liquids and gases. All four types of friction are described below. You can see a video demonstration of the different types at this URL:. Answer: static, sliding, rolling
Output:
What 3 types of friction occur between solid surfaces?