- Flying an object requires lift to oppose the object 's weight
- A glider is a kind of object
- Hence, flying a glider requires lift to oppose the weight of the glider

Therefore, flying a glider requires lift to oppose the weight of the glider
Question: In order for a glider to fly, its weight must be opposed by
Context: - Flying an object requires lift to oppose the object 's weight 
- A glider is a kind of object