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Terms 1
Terms 2
Application
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100
Define: axis
What is the straight line around which rotation takes place
100
Define: rotation
What is when an object turns about on an internal axis
100
Where will a ladybug have zero linear speed while sitting on a spinning record?
What is at the center of the record. The ladybug would have the greatest linear speed at the edge of the record. (Also, the ladybug's rotational speed will be the same anywhere on the record).
100
What is the formula for Centripetal Force?

Mass x speed2  

Divided by 

radius of curviture


100
Why will water not fall out of a bucket that is swinging in a vertical circle fast enough?
What is the bucket falls as fast as the water falls inside; therefore, the bucket is revolving and the water is moving tangentially as it falls, and stays in the bucket.
200
Define: rotational speed (or angular speed, as its sometimes called)
What is the number of rotations per unit of time (measured in revolutions or rotations per minute or second).
200
Define: revolution
What is when an object turns about on an external axis
200
On the outer rim of a Ferris Wheel, the rotating speed is 3 revolutions per minute. What is the rotational speed if instead you were half-way from the center to the outer rim?
What is 3 revolutions per minute (same)
200
What causes the centripetal force needed when a railroad train rounds a banked path? a. friction b. inertia c. vertical component of normal force d. horizontal component of normal force
What is d. horizontal component of normal force
200
Give an example of centripetal force in the world?
What is Example: the gravitational force holding Earth in orbit about the sun. String tension that holds a rock whirling in a circular path at end of string. Electrical force holding an electron in orbit about a nucleus.
300
Define: centripetal force
What is the force directed toward a fixed center that causes an object to follow a circular path. Means toward the center (ie: the inward force that acts on clothes in the spin cycle of a washing machine or inward force on tin can at end of a string going in a circle).
300
Define: linear speed
What is the distance traveled per unit of time (Note: you will have more linear speed the further you go from the axis, but your angular speed does not change.)
300
The tangential speed at the outer rim of a Ferris Wheel is 20 m/s. What is its tangential speed of a position half-way from the center to the outer rim?
What is 10 m/s
300
If inside a spare habitat, as the speed of the rotation increases, your weight will __________. a. increase b. decrease c. remain d. halve
What is a. increase
300
The reference frame for people observing centrifugal forces is when objects are____________________.
What is rotating
400
Define: centrifugal force
What is an apparent outward force on a rotating or revolving body. Means center fleeing-it is not a real force, but an effect of the rotation.
400
Define: tangential speed
What is the speed of something moving along a circular path (ie: if a tin can on a string breaks, it will continue tangent to the circular path it was on).
400
T/F: A centripetal force is not a real force.
What is FALSE: it is a real force because it is part of an interaction between two things.
400
If in a space habitat, if someone weighs 1 g living in the outer edge, how much would that person weigh if they moved halfway to the axis?
What is 1/2 g
400
T/F: If a car travels in a circle with constant speed, the net force on the card is directed toward the center of the curve.
What is True
500
What is the formula for centripetal force? the formulas for tangential speed?
What is CF=mass times speed divided by radius of curviture and TS=radial distance times rotational speed
500
Define inertia
What is the tendency of a moving object to follow a straight line path (this allows the centrifugal force effect (which is not attributed to a real force, yet to inertia).
500
Why does a person weigh less at the equator than they do at the poles? a. they wear more clothes b. spin of the Earth c. distance from the equator d. the temperature
What is b. spin of the Earth (therefore, if you want to weigh less you need to travel South, towards the southern hemisphere)
500
In a space habitat, the game room is located at 0.2 g. If a person can jump 0.6 m high in a 1 g region in the habitat, then how high could that person jump in the game room?
What is 3 m (or 5x higher) -Also, inside the habitat, the relative gravitational field along the axis is zero.
500
Explain Earth's internal and external rotation as related to chapter 10?
What is Internal axis=the rotation of the North/South poles. External axis=Earth revolves about the sun.