Momentum is a _____________ quantity because it has magnitude and direction.
vector
100
^0 stands for___________________.
angular displacement
100
A torque results when a force that is applied to an object causes the object to _____________.
rotate
100
Angular acceleration is dependent on the net _____________ applied.
torque
100
Counter-clockwise rotation is given a _________ sign.
positive
200
The total momentum of a system remains__________.
constant
200
Angular displacement indicates amount of _________________ an object has undergone.
rotation
200
A lever arm is the perpendicular distance between the ______________ and the line containing the force vector.
axis of rotation
200
The rotational quantity comparable to teh mass of an object is ____________________.
Moment of inertia
200
A negative torque rotates a stationary object in the _____________ direction.
clockwise
300
Objects in a perfectly_______________ collision become stuck together and travel as a single unit after collision.
inelastic
300
Represented by the Greek letter alpha and indicates the rate of change in angular speed.
angular acceleration
300
The amount of torque an object experiencies depends on the magnitude of the force, the distance, and the ______ at which the force is applied.
angle
300
As the distance from the axis of rotation increases, the value of I _______________________.
Increases
300
Rotational inertia ______________ as mass increases.
increases
400
Explain how an object with a large mass can have the same momentum as an object with a small mass.
The more massive object has a smaller velocity, and the less massive object has a greater velocity.
400
How long will a flywheel take to attain an angular velocity of 8.0 rev/s if the wheel starts from rest and has an angular acceleration of 7.2 rad/s? Use significant digits.
7.0 seconds
400
A 0.5 N force is applied to the handle of a wrench to rotate a screw. If the lever arm is 0.3 m long, find the torque applied to the screw.
0.15 Nm
400
An object with a greater value for I is __________ resistant to changes in rotational motion than an object with a lesser value for I.
more
400
Imagine you are spinning on the outer edge of a merry-go-round. If you want it to speed up, where should you move and why?
To speed up, move toward the enter because I decreases therefore your speed will increase. L=Iw
500
A 2.50 kg cart moving east at 0.60 m/s collides inelastically with a 1.40 kg cart moving west at 0.30 m/s. Determine the velocity of the combined carts.
Use mvi + mvi=(m + m) vf
2.5(0.6) + 1.4(-0.3)=(2.5 + 1.4) Vf
0.28 m/s to east
500
A figure skater begins spinning counterclockwise at an angular speed of 4.0 pi radians/s. During a 3.0 s interval, she slowly pulls hers arms inward and finally spins at 8.0 pi rad/s. What is her average angular acceleration during this time interval?
4.2 rad/s
500
A 700.0 N window washer is standing on a uniform scaffold supported by a vertical rope at each end. The scaffold weighs 200.0 N and is 3.00 m long. What is the force in each rope when the window washer stands 1.00 m from one end?
333 N, 567 N
500
A 0.70 kg ring measures 4 m in diameter. Determine the rotational inertia of the ring when it rotates about an imaginary axis passing through the center of the ring perpendicular to the plane of the ring.
2.8 kg*m2
500
A measure of how much input energy is lost compared with how much energy is used to perform work on an object is called the _______________ of a machine.