Module 11: Kinetics of Particles (Energy and Momentum) Flashcards
(27 cards)
mass centers on the two colliding bodies are on the line of impact
central impact
it is the ratio of the magnitudes of the impulses
corresponding, respectively, to the period of restitution and to the period of deformation
coefficient of restitution
it is the energy transferred to or from an object via the application of force along a displacement
work
We note that if the potential energy increases during the displacement, ________ is negative.
work
total momentum of particles conserved
perfectly plastic impact
it is the product of 𝑊 and the vertical displacement of the center of gravity of the body.
work of weight
When a particle moves from 𝐴1 to 𝐴2 under the action of a force 𝐹, the work of the force 𝐹 is equal to the change in kinetic energy of the particle. This is known
as the?
principle of work and energy
A force acting on a particle during a very short time interval that is large enough to produce a definite change in momentum is called an?
impulsive force
it is defined as the time rate at which work is done
power
______________________ of a machine is the ratio of the output work to the input work
mechanical efficiency
if either or both particles move along a line other than the line of the impact
oblique central impact
in oblique central impact, particles are assumed to be perfectly ___________ and ___________________
smooth, frictionless
A force acting on a particle during a very short time interval that is large enough to produce a definite change in momentum is called an impulsive force and the resulting motion is called an?
impulsive motion
it is the energy that is stored in an object due to its position relative to a certain reference
potential energy
on the other hand,
the work of 𝐖 is positive, the ______________ decreases
potential energy
central impact is where mass centers on the two colliding bodies are on the line of impact; otherwise, the impact is?
eccentric impact
if the velocities of the two particles are directed along the line of impact
direct central impact
If no external force is exerted on the particles or, more generally, if the sum of the external forces is zero, the second term in vanishes and the equation reduces to
conservation of linear momentum
in direct central impact, a period of _____________ will take place
restitution
All quantities involved are scalars and can be added directly, without using 𝑥 and 𝑦 components
method of work and energy
The potential energy (𝐕𝐠) of the body provides a measure of the work which can be done by its?
weight
The method cannot be used to directly determine
acceleration.
method of work and energy
total energy and total momentum are conserved
perfectly elastic impact
it is a collision between two bodies which occurs in a very small interval of time and during which the two bodies exert relatively large forces on each other
impact
