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TERM 1
frictional forces
DEFINITION 1 -kinetic=moving -kinetic friction=friction that occurs when 2 objects slide on another -Fk=MkN -Mk=static friction not moving. -Fstaticmax=MsN -more mass=more force to make an object move TERM 2
strings/springs
DEFINITION 2 T1-W=May T1=W T2=(W1+W)=May T2=(Wrope+w) T=tension W=weigh T-W=0 ->when motionless T-W=2M 2=a TERM 3
pully
DEFINITION 3 -> T1=Tcos40x+Tsin 40y -> T2=Tcos40x-Tsin40y TERM 4
Connected objects
DEFINITION 4 Total-> totalF=F+T-T=F Fnet=Ma (mass*acceleration(gravity)) a=F/M1+M2 M1-> F-T=M1a a=F-T/M1 M2-> T=M2a a=T/Ms TERM 5
Circular motion
DEFINITION 5 an object moving in a circle must have a force acting on it, otherwise it would move in a straight line. the direction of the force is toward the center of the circle. Fcp=Macp=MV^2/r -
magnitude of force acp=V^2/r Nsin(angle)=MV^2/r Fs=MV^2/r
TERM 6
Momentum
DEFINITION 6 momentum is a vector, its direction is its veloctiy. unit: Kg*m/s change in momentum- P=MV deltaP=Pf-Pi TERM 7
Newtons Second Law
DEFINITION 7 F= deltaP/delta(t) = Pf-Pi/delta(t) = MVf-MVi/delta(t) =M(Vf- Vi)/delta(t) = Ma TERM 8
Impulse
DEFINITION 8 impluse is a vector in the same direction as the average force I = Fav(delta(t))= Ma impulse also means change in momentum TERM 9
Conservation of Linear Momentum
DEFINITION 9 the net force acting on an object is the rate of change of its momentum summationF= (delta(P))/(delta(t)) internal forces can not change the momentum of a system. TERM 10
inelastic collisions
DEFINITION 10 collision: two objects striking one another inelastic collision:momentum is conserved but kinetic energy is not completely inelastic collision: objects strike together afterwards Pi=M1V1,i +M2V2,i Pf=(M1+M2)Vf Vf=M1V1+M2V2/M1+M
