A child is sitting on a merry-go-round that is spinning. If the child moves towa
Practice Questions
Q1
A child is sitting on a merry-go-round that is spinning. If the child moves towards the center, what happens to the angular velocity of the merry-go-round?
Increases
Decreases
Remains the same
Becomes zero
Questions & Step-by-Step Solutions
A child is sitting on a merry-go-round that is spinning. If the child moves towards the center, what happens to the angular velocity of the merry-go-round?
Correct Answer: Angular velocity increases.
Step 1: Understand that the merry-go-round is spinning and has a certain speed called angular velocity.
Step 2: Know that the child sitting on the merry-go-round has mass and contributes to the overall mass distribution, which is called moment of inertia.
Step 3: When the child moves towards the center, they are reducing the distance from the center of the merry-go-round.
Step 4: Realize that moving towards the center decreases the moment of inertia because the mass is closer to the axis of rotation.
Step 5: Remember the principle of conservation of angular momentum, which states that if no external forces act on the system, the total angular momentum remains constant.
Step 6: Since the moment of inertia decreases when the child moves towards the center, the angular velocity must increase to keep the angular momentum constant.
Angular Momentum Conservation – The principle that the total angular momentum of a closed system remains constant if no external torques act on it.
Moment of Inertia – A measure of an object's resistance to changes in its rotation, which depends on the mass distribution relative to the axis of rotation.
Angular Velocity – The rate of rotation of an object around an axis, typically measured in radians per second.
