Ball bearings have greater capability to run at high speed than roller bearings. Which option best expresses this comparison?

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Multiple Choice

Ball bearings have greater capability to run at high speed than roller bearings. Which option best expresses this comparison?

Explanation:
The main idea is that speed capability in bearings is influenced by how the contact between the rolling element and races affects friction and heat. Ball bearings have point contact between the balls and races, which produces lower rolling resistance and less heat at a given speed. Roller bearings use line contact, which increases contact area, leading to more friction and heat as speeds rise. Because of this difference, ball bearings can achieve higher rotational speeds than roller bearings under comparable loads, so the statement is expressed as “More.”

The main idea is that speed capability in bearings is influenced by how the contact between the rolling element and races affects friction and heat. Ball bearings have point contact between the balls and races, which produces lower rolling resistance and less heat at a given speed. Roller bearings use line contact, which increases contact area, leading to more friction and heat as speeds rise. Because of this difference, ball bearings can achieve higher rotational speeds than roller bearings under comparable loads, so the statement is expressed as “More.”

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