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General Physics 1 > Rotational Motion > Flashcards

Rotational Motion Flashcards

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1
Q

is defined as the tendency of an object at rest to remain at rest
and an object in motion to stay moving in a straight line at a constant velocity.

A

Inertia

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2
Q

also known as rotational inertia

A

Moment of Inertia

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3
Q

defined as the property of a rotating body to resist change in its state of rotation.

A

Moment of Inertia

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4
Q

SI unit for Moment of Inertia

A

kg ⋅m²

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5
Q

True or False:
Moment of inertia depends on the
distribution of the mass.

A

TRUE

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6
Q

True or False:
A mass which is at
greater distance from the axis of rotation has a
greater moment of inertia compared to the
same mass which is near the axis of rotation.

A

TRUE

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7
Q

gives a measurement of the resistance of the body
to a change in its rotational motion.

A

Moment of Inertia

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8
Q

The moment of inertia of a particle about an axis is obtained by multiplying the mass by the square of its distance from the axis.

A

I = mr², where m is mass, and r is the distance from the axis of rotation.

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9
Q

is the distance from an axis of rotation where the mass of a body may be assumed to be concentrated without altering the
moment of inertia of the body about that axis

A

Radius of gyration (𝑘)

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10
Q

The effectiveness of a force in rotating a body on which it acts is called

A

Torque 𝑟

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11
Q

can be determined by multiplying the force applied F by the perpendicular distance from the axis of rotation to the line
along which the force acts.

A

Torque

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12
Q

This perpendicular distance is called

A

Moment Arm or lever arm

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13
Q

Torque Formula

A

𝑟 = Frsin(theta)

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14
Q

If theta is = 90 can use the formula

A

𝑟 = 𝐹r

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15
Q

Torque Quantity

A

m⋅N or m⋅ (kg⋅m/s²)

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16
Q

True or False:
By convention, torque
is positive if it tends to produce counterclockwise rotation. It is negative if it tends
to produce clockwise rotation.

A

TRUE

16
Q

The greater the torque applied to an object, the greater its tendency to rotate

A

TRUE

17
Q

refers to the motion of a body turning about an axis, where each
particle of the body moves along a circular path.

A

Rotation

18
Q

The angular position is represented by

A

Theta

19
Q

The units for angular displacement may be

A

Degree, Radians, Revolution
(1 revolution = 360° = 6.28 radians = 2 π radians)

20
Q

is the rate at which angular displacement changes
with time.

A

Angular Velocity (ω)
may be expressed in deg/s, rad/s, or rev/s

21
Q

is the time rate of change of angular velocity.

A

Angular Acceleration � (Alpha)
maybe expressed in deg/s2, rad/s2, or rev/s2

22
Q

is concerned with the calculation of forces acting on and within
structures that are in equilibrium.

A

Statics

23
Q

is defined as a body at rest having zero acceleration and zero net force.

A

Static Equilibrium

23
Q

is defined as a body at rest having zero acceleration and zero net force.

A

Static Equilibrium

24
Q

is a useful concept when dealing
with equilibrium problem

A

Center of Mass/Gravity

25
Q

is the point where its entire weight may be assumed to be concentrated.

A

Center of Gravity of a Body

26
Q

the resultant of the forces acting on a body is not zero, the addition of another force called the ___________ is needed to balance the resultant to produce translational equilibrium.

A

Equilibrant

26
Q

The center of gravity of regularly shaped (symmetrical)
objects is located at their geometric centers. However,
some objects have their centers of gravity located toward
their thicker (massive) end and some objects located
outside them

A

TRUE

27
Q

2 conditions of body to be in rotational equilibrium.

A

The vector sum of all forces acting on it must be zero. (Translational)
The sum of all torques about any point must be zero. (Rotational)

28
Q

is that which something moves through space but doesn’t rotate.

A

Translational Motion

29
Q

description of motion.

A

Kinematics

29
Q

description of motion.

A

Kinematics

29
Q

linear speed of a point on the rim

A

tangential speed

30
Q

is the angle swept out by any line
passing through a rotating body that intersects the axis of rotation.

A

Angular displacement (θ), value is
positive if going counter-clockwise, negative if going clockwise

31
Q

is derivative of the change of angular displacement
over a change of time. Counterclockwise rotation is positive angular velocity
and negative if clockwise.

A

Angular Velocity

32
Q

rotational analogue for rotational motion

A

Angular Momentum (L), kg∙m2/s.

General Physics 1 (3 decks)

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