Lesson 2 Flashcards
The ________ of a moving point is the locus of its successive positions, and the ________ traveled by the point is the length of its path of motion.
path, distance
__________ of a point is the change of its position and is a vector quantity.
Displacement
__________ is the difference in position vectors R₁ and R₂.
Linear displacement
The magnitude of the linear displacement may be expressed in terms of the magnitudes ∆r and ∆y
∆s = √(∆r² + ∆y²)
Direction with respect to x axis is
tan Ψ = ∆y/∆x
_________ is the time rate of change of linear displacement.
linear velocity
fomrula for the average velocity
V(av) = ∆s/∆t
the average angular velocity of the body
ω(av) = ∆θ/∆t
the time rate of change of linear velocity
linear acceleration
____________ is the time rate of change of angular velocity
Angular acceleration
if the point has curvilinear motion, it will have a ____ resulting from a change in direction of its linear velocity.
normal acceleration
if the magnitude of its linear velocity changes, the point will have a ____________.
tangential acceleration
A particle having rectilinear translation has ______________ it its acceleration is proportional to the displacement of the particle from a fixed point and is of opposite sign.
Simple harmonic motion
mathematical expression for simple harmonic motion is _____________.
A = -Kx
____________ is the motion of a body in relation to some other body which is at rest.
Absolute motion
A body has motion _______ to another body only if there is a difference in their absolute motions.
relative
the driven member is called ____.
follower
rigid connector
coupler
if the driver and follower is in direct contact
direct-contact mechanism
driver is usually called _______ in direct-contact mechanisms
cam
_________ exists in a direct-contact mechanism whenever the bodies have relative motion along the tangent through their point of contact.
Sliding
____________ exists in a direct-contact mechanism if motion of the driving link compels the follower to move.
Positive drive
