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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.

tangent

### 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

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

360

6.28

57.3

theta

omega

1mile

the Earth

### what is an accelerometer

a device that measures acceleration

T

### moonth

time taken for Moon to orbit Earth (29.5days)

January 3

July 3

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

all of these

inward

tangent

outward

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

rotation and revolution

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

direct

the wide rim

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

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

a) outside

mg

### 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.

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

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)

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

### 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

the direction of gravitational pull of sun on the earth

### angular

the type of velocity found by dividing theta by seconds

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

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)

Example: