2. Mechanics Flashcards
Displacement (s)
distance traveled in a particular direction (change in position)
Velocity (u,v)
rate of change of displacement
Speed (u,v)
rate of change of distance
Acceleration (a)
rate of change of velocity
Newton’s First Law of Motion
An object at rest remains at rest and an object in
motion remains in motion at a constant speed in a straight line unless acted on by an
unbalanced force
Newton’s Second Law of Motion
F=ma
Newton’s Third Law of Motion
When two bodies A and B interact (push or
pull), the force that A exerts on B is equal and opposite to the force that B exerts on
A
Translational Equilibrium
net force acting on a body is zero
Momentum
product of mass and velocity
Impulse (J)
change in momentum
Law of Conservation of Linear Momentum
The total momentum of an isolated
system (no external forces) remains constant
momentum before = momentum after
Work (W)
The product of a force on an object and the displacement of the object
in the direction of the force
W=Fd
Kinetic Energy (Ek)
1/2mv^2
Change in Gravitational Potential Energy
mg(delta)h
Principle of Conservation of Energy
The total energy of an isolated system (no
external forces) remains constant
Elastic Collision
a collision in which kinetic energy is conserved
Inelastic Collision
a collision in which kinetic energy is not conserved
Power (P)
The rate at which work is done or the rate at which energy is
transferred
Efficiency
useful energy out / total energy in (x100 for percentage)
