AP Physics 1 Set 8

angular displacement

angle an object or a point on an object makes around the pivot point after rotating at a constant radius

translational displacement

length of the straight line from the objects starting position to its final position

angular velocity

equals change in angular displacement divided by change in time: w = ∆θ/∆t

right-hand rule

states that if you wrap your fingers around the object’s path, your thumb will point in the direction of the resultant vector

angular acceleration

equals the change in angular velocity divided by change in time: a = ∆w/∆t

center of mass

the point at which we could consider all the mass of the objects is to be concentrated

torque

the measure of a force’s effectiveness at making an object spin or rotate and is given by τ = rFsinθ

net torque

the sum of all torques, related to angular acceleration by τnet = |a

translational equilibrium

if the sum of the forces acting on it is zero, that is, if Fnet = 0

rotational equilibrium

an object is said to b in rotational equilibrium if the sum of the torques acting on it is zero, that is, if τnet = 0

static equilibrium

if an object is at rest, then it is said to be static equilibrium and both τnet = 0 and Fnet = 0

rotational inertia (aka moment of inertia)

the tendency of an object to maintain its angular velocity until acted upon by an outside net torque

angular momentum

the same way that objects moving in a straight line have linear momentum, objects experiencing rotation have this. It is also a vector quantity given by L = /w

rotational kinetic energy

another form of kinetic energy.