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  • how does rotation differ from revolution

    rotation is the turning on an internal axis while revolution is turning on an external axis.

    what is the direction of Earth's inertia as it travels around the Sun

    tangent

    what is the direction of the gravitational forces between Earth and the Sun

    radial

    provide a natural example of rotation

    Earth Day (24hours)

    provide a man-made example of rotation

    throwing a football (the spiral)

    provide a natural example of revolution

    Earth Year (365.25days)

    provide a man-made example of revolution

    Merry-Go-Round

    what is pie nine places past decimal

    3.141592654

    what is a radian

    a radian is an angle measure equal to a radius around a circle

    how many degrees are in a circle

    360

    how many radians are in a circle

    6.28

    how many degrees are in a radian

    57.3

    what is the greek letter used to represent degrees or radians

    theta

    what is the greek letter used to represent angular velocity

    omega

    what equations can be us to caluclate angular velocity

    omega= theta/seconds or rad/seconds

    1rpm=

    .105 rad/s

    1.61km=

    1mile

    what are all motion calculations relative to

    the Earth

    what is an accelerometer

    a device that measures acceleration

    T or F
    we only see one side of the moon

    T

    moonth

    time taken for Moon to orbit Earth (29.5days)

    what day are we closest to the sun

    January 3

    what day are we furthest from the sun

    July 3

    how would relative simulated gravity of a rotating space station change if
    a)it had twice the radius
    b)it had twice the angular velocity
    C)it had twice the radius and twice the angular velocity

    a)2xa
    b)4xa
    c)8xa

    compare and contrast centripetal force and centrifugal effect and supply examples of each

    centrifugal effect is a center fleeing tendency of an object to fly away from center, centripetal is the opposite. It is a center seeking force. example of centrifugal effect is in a car when tangential inertia and a centripetal force are acting upon an object it creates the centrifugal effect in which if you turn left the passenger will scoot towards the door. An example of centripetal force is when you spin a can on a string that enforces it to stay in circular motion.

    why are radians used in circular motion calculations

    because 6.28 radians = 360 degrees = number of degrees in a circle.

    which has the greater linear velocity, a horse near the outside of a carousel or one near the inside

    the outside horse

    which has a great angular velocity, a horse near the outside of a carousel or the one near the inside

    the have the same

    which of the following is a unit of angular velocity
    a) degrees/second
    b) rad/second
    c) rpm
    d) all of these
    e) none of these

    all of these

    what is the direction of a centripetal force

    inward

    what is the direction of a can's inertia that is whirled in a circle by a string

    tangent

    what is the direction of a centrifugal effect

    outward

    what type(s) of circular motion does a carousel horse 2m from the axis experience

    rotation and revolution

    what type of circular motion does a person stand on Earth's north pole experience

    rotation

    how are the wheels of a railroad car designed in order for them to turn at different speeds

    > diameter in

    what is true about our Moon's circular motion
    a) rotation>revolution
    b) rotation<revolution
    c) rotation=revolution

    rotation=revolution

    what proportionality exists between angular velocity x radius and linear velocity

    direct

    which end of a tapered cup rolls faster when it completes a circle

    the wide rim

    which record has the greatest angular velocity
    a) 16rpm
    b) 33.3 rpm
    c) 45rpm
    d) 78rpm

    d)78rpm

    earth rotates and revolves through space. earth rotates about the ______, which is an _______ axis. Earth revolves about the ______, which is an ________ axis.

    north/south pole, internal, Sun, external

    which type of circular motion for the earth is known as a revolution

    year

    which of these statements is true
    a) 360degrees=6.28radians
    b) 1rpm=.105rad/s
    c) 1radian=57.3degrees
    d) all of these

    d)all of these

    what causes the centrifugal effect

    centripetal force and tangential inertia

    what supplies the centripetal force when a car turns in a circle

    road pushes tire

    which carousel horse has greater centripetal force
    a) outside
    b) inside
    c) outside=inside

    a) outside

    Tx=

    mv^2/radialdistance

    what techniques for measuring r and theta would you recommend for best results

    I used the tangent equation and derived for theta. I used the theta that I found and plugged it into the sin equation to find the opposite side, then I used the theory of similar triangles and lasers to find the radius.

    for circular motion the tension will always be _______ the weight

    greater than

    what do you conclude about the direction of the net force that keeps the flying pig in uniform circular motion

    The direction of the net force is in a radial direction towards the center/centripetal

    for uniform circular motion the centripetal force will always be _______ the tension in the string

    less than

    how did the pig overcome air friction

    the pig overcomes air friction by flapping its wings. this creates a centripetal force on the pig which in turn counters friction

    list sources of error for pig lab

    -timing not precise
    -didn't find the exact point at which the hypotenuse reaches the other leg of the triangle with the laser

    accelerometer

    a device that measures acceleration

    diameter

    the distance across a circle

    day

    one earth rotation equal to 24 hours or 86,400 seconds

    LP

    long play record with 33.3rpm

    rpm

    acronym for revolutions per minute (equal to .105 rad/s)

    radius

    half of a diameter

    pi

    the coefficient resulting from the circumference of a circle being divided by its diameter

    carousel

    a merry-go-round

    tangent

    the direction of a planet's momentum while in orbit

    circle

    360 degrees of 6.28 radians

    axis

    a straight line around which circular motion takes place

    year

    one earth revolution equal to 365.25 days

    revolution

    spinning with axis outside of a system

    centripetal

    a true center seeking force

    rotation

    spinning with axis inside a system

    radial

    the direction of gravitational pull of sun on the earth

    angular

    the type of velocity found by dividing theta by seconds

    radian

    angle measure equal to length of radius around the circumference of a circle (57.3 degrees)

    centrifugal

    an apparent center fleeing effect

    what type of circular motion does rpm apply to

    both rotation and revolution

    equation for theoretical speed of the pig

    v=√rg

    equation for computing the speed of the pig

    v=d/t=2(pi)(r)/t

    percent difference equation

    (o-e)/e (100)

    equation used to calculate the omega and linear velocity of earth's rotation

    omega=theta/t
    v=omega(r)

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