Power is the rate at which work is done or energy is transferred and is measured in ________.
New cards
2
different application
Parallel forces act in the same direction on an object but have ________ points.
New cards
3
Torque
________ is used to describe the motion of objects that rotate around a fixed axis, such as a wheel or a gear.
New cards
4
Inertia
________ can be thought of as a measure of an object's resistance to a change in its state of motion and is related to the object's energy and momentum.
New cards
5
external torque
A(n) ________ can change the angular momentum of an object or system, causing it to rotate faster or slower, or to change direction.
New cards
6
circular motion
The frequency of an object in ________ is the number of rotations per unit time and is equal to the inverse of the period.
New cards
7
property of matter
It is a(n) ________ that causes an object to maintain its current velocity and direction of motion unless acted upon by an external force.
New cards
8
Torque
________ is the measure of a force's ability to cause rotational motion and is equal to the force times the lever arm (the distance between the force and the axis of rotation)
New cards
9
Rigid body equilibrium
\
zero translational (linear) or angular acceleration 1. sum of external forces = 0 N 2. sum of externally applied torques = 0 Nm \*can be in static or dynamic equilibrium
New cards
10
\ center of mass
average location of mass - Fg is not considered - CM = center of gravity when there is a uniform gravitational field (ex: on earth, in classroom) - when solving for center of mass, solve for x and y coordinates individually
New cards
11
\ center of gravity
Fg considered- finding torque produced by Fg: weight of the object can be considered to be concentrated at a single point
New cards
12
moment of inertia (I)
resistance to a change in the rotational state of moment of an object- resistance to angular acceleration- depends upon distribution of mass and shape
New cards
13
torque and angular acceleration
when a rigid body is subjected to a net torque (t≠0), it undergoes angular acceleration \*relationship analogous to Newton's second law
New cards
14
Arc length
S = rθ (m) = (m)(rad)
New cards
15
Period (T)
time it takes to complete a full rotation on a closed path = 1/frequency (f)
New cards
16
Conservation of energy
conservative forces only → all conservative forces should be included (TKE + RKE +PEG)i = (TKE + RKE +PEG)f the principle that the amount of energy in a system is constant
\
New cards
17
rotational kinematic variables
angular displacement (θ) - change in theta angular velocity (ω) - angular displacement over time angular acceleration (α) - change in angular velocity over time
New cards
18
angular momentum - right hand rule
fidget spinner → angular momentum keeps the fidget spinner upright, torque causes procession spinning on platform → if the wheel is spinning towards the left, platform is spinning towards the right
Studied by 12 people
