77 terms

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

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)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

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

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

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

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

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

b) inside

c) outside=inside

a) outside

Ty=

mg

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

-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)

v=omega(r)