#1
A rotating object has angular momentum pointing in which direction?
Perpendicular to its axis of rotation.
ExplanationAngular momentum points perpendicular to its axis of rotation.
#2
Which of the following is a unit of angular momentum?
Kilogram meter per second
ExplanationAngular momentum is measured in Kilogram meter per second.
#3
If the net external torque acting on a system is zero, what can be said about the angular momentum of the system?
It remains constant.
ExplanationIf the net external torque acting on a system is zero, the angular momentum of the system remains constant.
#4
Which of the following quantities is analogous to linear velocity in rotational motion?
Angular velocity
ExplanationAngular velocity is analogous to linear velocity in rotational motion.
#5
What is the unit of angular velocity?
Radians per second
ExplanationThe unit of angular velocity is Radians per second.
#6
Which of the following is a correct statement about angular momentum?
Angular momentum depends on the point about which rotation occurs.
ExplanationAngular momentum depends on the point about which rotation occurs.
#7
Which of the following equations represents the correct relationship between torque (τ), moment of inertia (I), and angular acceleration (α)?
τ = I * α
ExplanationThe correct relationship between torque (τ), moment of inertia (I), and angular acceleration (α) is τ = I * α.
#8
Which of the following statements best describes the conservation of angular momentum?
Angular momentum is only conserved in rotational motion with no external torque.
ExplanationAngular momentum is conserved only in rotational motion with no external torque.
#9
What does the moment of inertia measure in rotational motion?
The resistance of an object to angular acceleration
ExplanationThe moment of inertia measures the resistance of an object to angular acceleration in rotational motion.
#10
Which of the following is a valid expression for the angular momentum of a point mass rotating about an axis?
L = m * v * r
ExplanationThe angular momentum of a point mass rotating about an axis is expressed as L = m * v * r.
#11
A spinning ice skater pulls her arms inward, causing her rotational speed to increase. What happens to her angular momentum?
It increases.
ExplanationWhen the ice skater pulls her arms inward, her angular momentum increases.
#12
In which scenario is angular momentum conserved?
When a torque is applied to change the rate of rotation
ExplanationAngular momentum is conserved when a torque is applied to change the rate of rotation.
#13
A wheel rotating about its axis has a constant angular velocity. If its radius is doubled, what happens to its angular momentum?
It remains the same.
ExplanationIf the radius of a wheel rotating about its axis is doubled, its angular momentum remains the same.
#14
A solid disk and a ring, both having the same mass and radius, are rolled down an incline. Which object reaches the bottom first?
The ring
ExplanationThe ring reaches the bottom first when rolled down an incline.
#15
A gyroscope maintains its orientation in space due to which principle of physics?
Conservation of angular momentum
ExplanationA gyroscope maintains its orientation in space due to the conservation of angular momentum.