Two identical metal balls are rolling without slipping along a horizontal surface with speed V. Each ball encounters a hill ('two-sided' ramp) of height H. The hill encountered by Ball A is frictionless, while Ball B rolls without slipping over its hill. How does the angular velocity of Ball A compare to that of Ball B when they reach the top of the hill?

The angular velocity of Ball A will be greater than the angular velocity of Ball B when they reach the top of the hill.

Explanation:

Angular velocity can be defined as how fast an object rotates relative to a given point or frame of reference.

The question said the hill encountered by Ball A is frictionless, so Ball A will continue to rotate at the same rate it started with even when it reached the top of the hill.

Ball B on the other hand rolls without slipping over its hill, i.e there's friction to slow down its rotational motion which thus reduces how fast Ball B will rotate at the top of the hill

Atmospheric pressure is commonly measured with a barometer. In a barometer, a column of mercury in a glass tube rises or falls as the weight of the atmosphere changes. Meteorologists describe the atmospheric pressure by how high the mercury rises.

Atmospheric Pressure

The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.

GRADES

6 - 12+

SUBJECTS

Earth Science, Meteorology, Geography, Physical Geography, Physics