angular momentum
The product of a rotating object's moment of inertia and the angular speed about the same axis.
center of mass
The point at which all the mass of the body can be considered to be concentrated when analyzing translational motion.
lever arm
The perpendicular distance from the axis of rotation to a line drawn along the direction of the force.
moment of inertia
The tendency of a body rotating about a fixed axis to resist a change in rotational motion.
rotational kinetic energy
The energy of an object due to its roational energy.
torque
A quantity that measures the ability of a force to rotate an object around some axis.
axis of rotation
The imaginary point or line around which an object rotates
extended object
An object that has a definite, finite size and shape.
symbol for torque
The Greek letter tau is the __________.
perpendicular
At an angle of 90? to a given line, plane, or surface.
center of gravity
equivalent to the center of mass
Newton's second law of motion
The acceleration of an object depends on the mass of the object and the amount of force applied.
translational motion
Motion in a straight line. Definite direction.
point mass
In physics, this is an object with a nonzero mass and no other properties or structure.
inclined plane
Identify the simple machine shown in the figure.
wedge
Identify the simple machine shown in the figure.
screw
Identify the simple machine shown in the figure.
lever
Identify the simple machine shown in the figure.
wheel and axle (or pulley)
Identify the simple machine shown in the figure.
simple machine
changes the direction or magnitude of an input force
input force
the force you exert on a machine
output force
the force exerted by a machine
The distance moved increases.
* When a machine decreases the force acting on an object, what happens to the distance the object moved?
The distance moved decreases.
* When a machine increases the force acting on an object, what happens to the distance the object moved?
A machine can increase or decrease the force acting on an object at the expense or gain of the distance moved.
* Explain how the operation of a simple machine alters the applied force and the distance moved.
Net torque is equal to an object's momentum of inertia multiplied by its angular acceleration.
* Describe Newton's second law of rotation.
the more torque is produced
The farther the force is from the axis of rotation, _____________.
both the ball's linear and rotational speeds
The total kinetic energy of a baseball thrown with a spinning motion is a function of ________.
farthest from the axis of rotation
Where should a force be applied on a lever arm to produce the most torque?
middle of inside curve
Where is the center of mass for a boomerang?