Chp 12 rotational motion flashcardizz review

Front

What is rotational inertia?

Back

Rotational inertia, also known as moment of inertia, is a measure of an object's resistance to changes in its rotational motion. It depends on the mass of the object and the distribution of that mass relative to the axis of rotation.

Front

True or False: An object with a greater rotational inertia will roll down an incline more quickly than one with a smaller rotational inertia.

Back

False. An object with a greater rotational inertia will roll down more slowly because it resists changes to its rotational motion.

Front

What position makes it easier to spin: tucked or outstretched?

Back

Tucked position. When a body is in a tucked position, it has less rotational inertia, making it easier to spin.

Front

Which object has the most rotational inertia: hollow sphere, solid sphere, disk, or cylinder?

Back

Hollow sphere. Among these objects, the hollow sphere has the greatest rotational inertia when considering equal radius.

Front

True or False: Rotational inertia depends on the distribution of mass in the object.

Back

True. The distribution of mass affects how much rotational inertia an object has.

Front

What happens to angular momentum when a gymnast pulls into a tuck position while swinging?

Back

The angular momentum remains the same, but the rotational inertia decreases.

Front

Define angular momentum.

Back

Angular momentum is the quantity of rotation of an object and is the product of its moment of inertia and its angular velocity.

Front

What is the relationship between rotational inertia and angular velocity?

Back

As rotational inertia increases, angular velocity decreases if angular momentum is conserved.

Front

How does mass distribution affect rotational inertia?

Back

Mass that is further from the axis of rotation increases rotational inertia more than mass that is closer to the axis.

Front

What is the formula for calculating rotational inertia for a solid disk?

Back

I = (1/2) m r², where I is the rotational inertia, m is the mass, and r is the radius.