An umbrella tends to jerk upward on a windy day principally because

Question

Quizplus · Accepted Answer

The curved top surface of the umbrella causes the air pressure to be reduced above it, creating a low-pressure zone. This low-pressure zone creates a lifting force on the umbrella, causing it to jerk upward on a windy day. Option A is incorrect as trapped air getting warm and rising would not cause the umbrella to jerk upward. Option B is incorrect as buoyancy does not have a significant role in this case.

An Umbrella Tends to Jerk Upward on a Windy Day