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AP Physics, Chapter 10, Rotational Motion

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How do you find the direction of the angular acceleration?

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Mar 1, 2020

Cards (21)

Section 1

(21 cards)

How do you find the direction of the angular acceleration?

Front

If the object speeding up, the angular acceleration vector is in the same direction as the angular velocity. If the object is slowing down, the angular acceleration is opposite the direction of the angular velocity.

Back

For the torque from force F to be a maximum, what must be the value of angle theta?

Front

90 degrees

Back

In what position do you have a smaller moment of inertia: arms in or arms out.

Front

Arms in (mass closer to axis)

Back

Torque

Front

The quantity that can change the rotational motion of an object (the rotational counterpart to a force).

Back

Angular Displacement

Front

How far an object rotates (the angle through which an object rotates).

Back

What is the true axis for an object that is rolling?

Front

The base of the object (that is in contact with the ground).

Back

For a spinning tire, how do the angular speeds of a point near the center and a point near the outer edge compare?

Front

All points on a rotating object have the same angular speed.

Back

What is this the symbol for?

Front

Angular Acceleration

Back

In the torque equation, what is the purpose of the sin (theta)?

Front

To put the radius and the force at right angles to each other.

Back

What is this the symbol for?

Front

Torque

Back

Rank these objects from highest moment of inertia to lowest moment of inertia (assume masses are equal): disk, thin ring, thick ring.

Front

Thin ring, thick ring, disk

Back

Which object will reach the bottom of an incline first, one that rolls or one that slides with no friction)? Explain.

Front

All of the gravitational potential energy goes into linear kinetic energy for the sliding object so it will be traveling faster and reach the bottom first.

Back

Angular Acceleration

Front

The rate of change of angular velocity

Back

What is parallel axis theorem used for?

Front

Allows you to adjust the moment of inertia equations for use when the axis is not at the center of mass of the object (by adding an Md^2 term to the center of mass moment of inertia equation).

Back

For a spinning tire, how do the linear speeds of a point near the center and a point near the outer edge compare?

Front

The point that is farther out has the higher linear speed (v = rw).

Back

For a spinning object to have non-zero values for tangential acceleration, centripetal acceleration, and angular acceleration; describe the motion of the spinning object.

Front

The object must be speeding up or slowing down...changing its angular velocity.

Back

How do you find the direction of the angular velocity?

Front

Right hand rule: wrap the fingers of your right hand in the direction the object is rotating then your thumb points the direction of the angular velocity vector (along the axis).

Back

What is this the symbol for?

Front

Angular velocity

Back

Angular velocity

Front

How fast an object is spinning (rate of change of angular displacement)

Back

Radian

Front

a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius.

Back

What is this the symbol for?

Front

Angular Position

Back