o If m1=m2 and moving 1 collides with stationary 2, then v1=0, v2=u1 i.e. the second ball moves off with the original velocity of the first and the first remains stationary
o
If m1<<m2 and minute
mass 1 collides with massive stationary mass 2 then v1»-u1
and v2»0
o If m1>>m2 and massive mass 1 collides with stationary minute mass 2 then v1»-u1 u1 and v2»2u1
Recall and use:
ü E= ½mv2 Kinetic Energy = ½ x mass x (velocity)2
ü E=mgDh Potential Energy = mass x g x height change
· v=Ö(2gh)
ü W=Fd Work done = force applied x distance moved in direction of force
· Efficiency = (useful energy out)/(total energy in)
ü P = Fv Rate of transfer (power) = force applied x velocity (if F & v constant)
· P=dW/dt
ü FDt=Dmv Impulse = change in momentum OR force = rate of change of momentum
· F=dp/dt
ü F=ma Force = mass x acceleration for constant mass
ü pV=nRT pressure a 1/volume (n=moles, R=molar gas constant, T=temp)
ü Fmax = mN Limiting value of frictional force = coefficient of friction x normal reaction force
Use (given on formula sheet):
Ø F = kx
Ø stress = tension/cross-sectional area
Ø strain = extension/original length
Ø Young modulus = stress/strain
Ø g = Fl/Ax
Ø elastic strain energy = ½ kx2
Ø elastic strain energy per unit volume = ½ stress x strain
Ø pV=1/3Nmc2 pressure x volume = 1/3 particles x mass of 1 particle x (average velocity)2
Ø p = 1/3 rc2 pressure p, density r, average velocity squared c2
Ø mean kinetic energy