Rotational Motion

Question 1

The greater the rotational inertia, the more difficult to change the?

Answer 1

rotational speed of an object.

Question 2

What law states that the energy cannot be created or destroyed, but it can be transferred.

Answer 2

the first law of thermodynamics or also known as LAW OF CONSERVATION OF ENERGY

Question 3

The resistance of an object to changes in its
rotational motion is called

Answer 3

rotational inertia
(sometimes moment of inertia).

Question 4

This is is required to change the rotational
state of motion of an object.

Answer 4

TORQUE

Question 5

What happens In the object with the absence of a net torque

Answer 5

a rotating object keeps rotating, while a non-rotating object stays non-rotating.

Question 6

The greater the distance between an object’s mass concentration and the axis of
rotation is equal to

Answer 6

The greater the rotational inertia.

Question 7

rotational inertia of an object is not necessarily a fixed quantity It is greater when the mass within the object is?

Answer 7

Extended from the axis of rotation.

Question 8

When swinging your leg from your hip, why is the rotational inertia of the leg less when it is bent?

Answer 8

The rotational inertia of any object is less when its mass is concentrated closer to the axis of rotation.

Question 9

The major axes of rotation of the human body are the ___ axis, the ___ axis, and the ___ axis.

Answer 9

longitudinal (head to toe), transverse, medial (front to back)

Question 10

How does rotational inertia affect how easily the rotational speed of an object changes?

Answer 10

The greater an object’s rotational inertia, the more difficult it is to change the rotational speed of the object

Question 11

The three major axes of rotation of the human body are

Answer 11

at right angles to one another and pass through the center of gravity

Question 12

The human body’s longitudinal axis has the

Answer 12

least rotational inertia of the three body axes.

Question 13

You rotate about your _____ when you perform a somersault or a flip.

Answer 13

transverse axis (2)

Question 14

Objects of the same shape but different sizes accelerate equally or not equally when rolled down an incline.

Answer 14

equally

Question 15

Which will roll down an incline with greater acceleration, a hollow cylinder or a solid cylinder of the same mass and
radius?

Answer 15

The hollow cylinder—has the greater
rotational inertia.
The solid cylinder will roll with greater acceleration.

Second possible answer: the cylinder with the SMALLER ROTATIONAL inertia because the cylinder with the GREATER ROTATIONAL inertia requires more time to get rolling.

Question 16

A heavy iron cylinder and a light wooden cylinder, similar in shape, roll down an incline. Which will have more acceleration?

Answer 16

The cylinders have different masses, but the same rotational inertia per mass, so both will accelerate equally down the incline.

NOTE: All objects of the same shape have the same “laziness per mass” ratio. (THIS EXCLUDES A HOLLOW AND SOLID OBJECTS)

Question 17

Would you expect the rotational inertia of a hollow sphere about its center to be greater or less than the rotational inertia of a solid sphere?

Answer 17

Yes greater, the rotational inertia of a hollow
sphere would be greater than that of a same-mass solid sphere for the same reason: the mass of the hollow sphere is farther from the center.

Question 18

What happens when objects of the same
shape but different sizes are rolled down
an incline?

Answer 18

Objects of the same shape but different sizes accelerate equally when rolled down an incline.

Question 19

Newton’s first law of inertia for rotating systems states that an object or system of objects will maintain its angular momentum unless

Answer 19

acted upon by an unbalanced external torque.

Question 20

defined as the product of rotational inertia

Answer 20

Angular momentum (Anything that rotates keeps on rotating until something stops it)

Question 21

An external net force is required to change the

Answer 21

Linear momentum and angular momentum of an object

Question 22

How does Newton’s first law apply to
rotating systems?

Answer 22

An object rotating about an internal axis tends to keep rotating about that axis.

Rotating objects tend to keep rotating, while
non-rotating objects tend to remain non-rotating.

The resistance of an object to changes in its
rotational motion is called rotational inertia
(sometimes moment of inertia).

Question 23

Angular momentum is conserved when

Answer 23

no external torque acts on an object.

Question 24

law of conservation of angular momentum states that if no unbalanced external torque acts on a rotating system

Answer 24

the angular momentum of that system is constant.

Question 25

How is gravity simulated?

Answer 25

not sure pero i think because of CENTRIFUGAL FORCE