Front

What is the conservation of angular momentum?

Back

The principle that the total angular momentum of a closed system remains constant if no external torques act on it.

Front

How does an ice skater increase their spin rate?

Back

By pulling their arms in, which reduces their moment of inertia and increases their spin rate due to conservation of angular momentum.

Front

What are the three major axes of rotation in the human body?

Back

The three axes are the longitudinal axis (vertical), the transverse axis (horizontal), and the anteroposterior axis (front to back), all passing through the center of gravity.

Front

What is rotational inertia?

Back

Rotational inertia, or moment of inertia, is a measure of an object's resistance to changes in its rotational motion, depending on the mass distribution relative to the axis of rotation.

Front

Does a short pendulum have more or less rotational inertia than a long pendulum of the same mass?

Back

A short pendulum has less rotational inertia than a long pendulum of the same mass.

Front

What factors affect rotational inertia?

Back

Rotational inertia depends on the mass of the object and the distribution of that mass relative to the axis of rotation.

Front

What is torque?

Back

Torque is a measure of the rotational force applied to an object, which causes it to change its rotational state of motion.

Front

What is the relationship between torque and angular acceleration?

Back

Torque is directly proportional to angular acceleration; greater torque results in greater angular acceleration, according to Newton's second law for rotation.

Front

What is the formula for calculating torque?

Back

Torque (τ) = Force (F) x Distance (r) x sin(θ), where θ is the angle between the force vector and the lever arm.

Front

What is the significance of the center of gravity in rotational motion?

Back

The center of gravity is the point where the weight of an object is balanced, and it plays a crucial role in determining how an object rotates.