Rotational/Translational
Rotational quantities are based upon ________ whereas
translational motion quantities are based upon
_________
angle
distance
What does torque cause?
Changes in rotational motion
What could you graph so that I, moment of inertia, is the
slope?
Graph of torque vs alpha
State the work-energy theorem.
W = ΔE
Work is the area under what graph?
Force vs distance traveled
What equation allows you to convert between
translation and rotational kinematic variables?
Trans = rRot
(x = rθ, v=rω, a=rα)
What is rotational inertia?
Resistance to changes in rotational motion (Δω or α)
What causes angular acceleration?
net external torque
Positive work is done by a force in the ________
direction as an object’s displacement.
Same
How do you calculate work?
W = F//d or Fdcosθ
Write the corresponding rotational variable for each of
these translational variables: x, v, a, m, F, p, K
θ, ω, α, ɪ, τ, L, Krot
What is the equation for rotational inertia of a point
mass?
ɪ = mr2
What equation do you use for an object in rotational
equilibrium?
τcw = τccw
Negative work is done by a force in the _____ direction
as an object’s displacement.
Opposite
What is power?
List an alternate way of calculating power.
Work or energy per time
P = Fv
Which kinematic quantities depend upon radius,
translational or rotational?
Translational
How do you determine the rotational inertia of multiple
objects that are combined?
Add ɪ for each part
When is mechanical energy conserved?
Closed systems, no net external force, no non-
conservative forces (like friction)
No work is done by a force acting _____________ to an
object’s displacement
Perpendicular
When does the law conservation of energy apply?
Write the law of conservation of energy
Closed systems, no net external force, no non-
conservative forces (like friction)
All parts of a rotating object have the same..
Rotational kinematic values
Give two equations to solve for torque:
τ = ɪ α
τ = rꞱF or rFsinθ
List the 4 types of mechanical energy and give the
equation for each
K = ½ mv2
Ug = mgh
Krot = ½ ɪω2
Us = ½ kx2
Does work or energy have a direction?
NO
Correct the law of conservation of energy when friction
is present
ME0 = MEf + WFf