Physics Overall Flashcards
What are the two groups that fermions are broken down into
quarks and leptons
What are the six flavours of quark?
up down strange charm top bottom
What particles are in the leptons group?
electron muo tau as well as the neutrino counterpart of each
Name the 3 composite particles?
Hadron Baryon Meson
What is a hadron
a term used to describe any particle made of quarks. There are two basic types of hadron and these are Baryon and Mesons
What is a baryon
A subatomic particle made of three quarks. Examples include protons and neutrons
What is a meson
A subatomic particle made of two quarks (usually one quark and one anti quark)
list the two properties of a projectile
all projectiles have a constant acceleartion and a constat horizontal velocity
State the universal law of gravitation
there is a gravitational force between any two objects however it is usually negligible unless at least one of the objects is very large. The force of attractiona cts equally on both objects
Defintion of momentum
momentum is quite simply the product of mass and velocity for an object. It is a vectotr quantity
What is the principle of conversion of momentum
when objects collide(or explode apart) the total momentum of all the objects before the collision is equal to the total momentum of all the objects after the collision in the absence of external forces.
What are the four impluse equations?
ft = mv-mu = area under F-t graph = deltaP
What are the four impluse equations?
ft = mv-mu = area under F-t graph = deltaP
Define cosmic background radiation
it supports the big bang theory and is detected in all directions
If something is in redshift what does that mean in respect to you
it is moving away from you
Define dark energy
explanation for accelerating of the expansion of the universe
Define relativistic length contraction
A phenomenon observed when objects move at high velocity is that their length as measured by a “stationary” observer will appear to contract
Define constructive interference
constructive interference is when waves from two identical sources meet in phase. A detector placed in a position of constructive interference will detect a longer amplitude of wave.
Define destructive interference
destructive interference is when waces from two identical sources meet exactly out of phase(by half a wavelength.) A detector in this position will detect a smaller or even zero amplitude.
Explain why a person walking in front of two speakers will hear changes in the volume of sound when the amplitude of the speakers are constant
As they walk across the room they move through positions where the waves from the two sources meet in and out of phase. When they meet in phase a louder sound is heard due to construcitve interference. when they meet out of phase a quieter sound is heard due to destructive interference.
If Kinetic Energy is lost during a collison is it Elastic or Inelastic
Inelastic
If Kinetic Energy is gained during a collision is it Inelastic or Elastic
Elastic
What unit does Impulse have?
Ns(Newton,Seconds)
Define Dark Matter
makes galaxies spin too fast and you cant protect it easily