If the radius of a rotating object is halved while keeping the angular velocity

₹0.0

Question: If the radius of a rotating object is halved while keeping the angular velocity constant, what happens to its linear velocity? (2022)

Options:

Correct Answer: It halves

Exam Year: 2022

Solution:

Linear velocity v = rω, so if r is halved and ω remains constant, v also halves.

If the radius of a rotating object is halved while keeping the angular velocity constant, what happens to its linear velocity? (2022)

If the radius of a rotating object is halved while keeping the angular velocity constant, what happens to its linear velocity? (2022)

Step 1: Understand the formula for linear velocity, which is v = rω, where v is linear velocity, r is the radius, and ω is angular velocity.
Step 2: Identify that in this scenario, the radius (r) is being halved. This means if the original radius is r, the new radius will be r/2.
Step 3: Note that the angular velocity (ω) remains constant, meaning it does not change.
Step 4: Substitute the new radius into the formula: v = (r/2)ω.
Step 5: Compare the new linear velocity to the original: the original linear velocity was v = rω, and the new linear velocity is v = (r/2)ω.
Step 6: Realize that (r/2)ω is half of rω, so the new linear velocity is half of the original linear velocity.
Step 7: Conclude that if the radius is halved while keeping angular velocity constant, the linear velocity also halves.

Linear Velocity and Angular Velocity Relationship – The relationship between linear velocity (v), radius (r), and angular velocity (ω) is given by the formula v = rω. This concept tests the understanding of how changes in radius affect linear velocity when angular velocity is constant.