PHYS 161H Lecture Notes - Lecture 6: Inelastic Collision, Elastic Collision, Gravity Assist
16 Mar 2016
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Momentum p=mv momentum equals mass times velocity kilogram meters per second. Impulse: change in momentum that acts on a finite interval of time. P=pf-pi= integral from (ti to tf) of (dp/dt) = integral (from ti to tf) fnetdt. Direct consequence of newton"s third law: particle a and particle b exert force on each other, attractive forces: B exerts f(b on a) and a exerts f(a on b: f(b on a)=-f(a on b, f(b on a)=dpa/dt, f(a on b)=dpb/dt, 0=d(pa+pb)/dt=0=net momentum=constant. 95kg running east at 4. 1 m/s : p=389. 5i. Deep space initial to final point rocket that is initially stationary: needs to acquire a velocity, so must accelerate, so must push off against its own fuel. Collisions: 2 non interacting particles approach each other, interact for a short time (exert forces on each other, emerge with different velocity (vector) than they started. 1- momentum: ma*(vai)+mb(vbi)= ma v(af) + mb v(bf)
