Physics 200 (Test 3)

version from 2016-10-07 04:55

Section

Eq - linear momentum (p)p = m*v
Eq - CHANGE in linear momentum (Δp)Δp = mv(f) - mv(i)
when p increases by 4, KE increases by _16 (square of momentum)
impulse - DefineThe product of the force acting on a body times the time interval
Eq Impulse (I) STANDARD =ΣF(avg) * Δt = I = Δp
Calc Eq Impulse (I) = ∫ (ΣF)dT = I = Δp
Equal net work inputs implies = ?Kinetic Energy (KE)
When a person in accident, increasing the _ lessens the damageΔt
While in motion, does a baseball carry force?No - force requires tht two objets act on one another
Can a baseball have MORE KE than a bat at rest?No - conservation of energy
Can a ball deliver MORE p to a bat and batter Yes - by bouncing off the bat/batter it can
why doesnt recoil throw guns?The KE of the bullet is FAR greater than the gun. Would require more velocity to move gun
Bomb explodes. Is p conserved? what is total of p?Yes. the fragments p is all equal to the inital bomb - 0
Bomb explodes> Is KE conserved?No. The PE of the chemicals is CHANGED into KE of explosion
Impulse-Momentum Theorem Δp = F*Δt → F = (Δp)/(Δt) = (m)[(v(f) - v(i))/(Δt)]
p is conserved IFF _There is NO net external force acting on an object
Inelastic collisions - EqΣk(i) = Σk(f)
Elastic Collisions - EqΣk(i) ≠ Σk(f)
Perfect Inelastic - define - KE is _Collide and stick together - KE is conserved