Further Mechanics Flashcards
Linear momentum equation?
ρ = mv
What is the law of conservation of momentum?
Assuming no external forces act, momentum is always conserved.
How ( in what direction ) is energy transferred in collisions?
Parallel to the direction of impact
What is the formula for force relating to momentum?
F =Δρ/Δ t
What is impulse?
Δ Momentum = ΔF x Δt
The change in momentum of an object
What is KE in terms of momentum?
KE = ρ² /2m
What happens to kinetic energy in a collision?
It isn’t always conserved. May be transferred to surroundings
What is an elastic collision?
Collision in which energy is conserved
What’s an inelastic collision?
Total KE after < KE before
In what forms may energy be “lost” ?
Transferred to other stores in the form of heat or sound.
What’s a completely inelastic collision?
One body is embedded in another
If 2 objects have an equal mass in an elastic collision, in what direction will they move away from each other?
90⁰ to each other
What’s angular displacement?
The angle in which you have turned through
θ= s(arc length) / r(radius)
What centripetal force + formula?
The resultant force acting towards the centre of a circle.
F= mv²/r
Or
F=mω²r
What is angular velocity formula?
ω = v / r
Or
ω = 2π / T (period)
