equal to the mass of the object times the object’s velocity; is a vector
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2
impulse
J = F \* △t (N x s)
area under F/t graph
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3
impulse-momentum theorem
only external impulse can change an object’s momentum; J = △p and F \* △t = pF-po
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4
Fpeak
point of maximum compression
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5
Favg
= 0.5Fmax
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6
greatest impulse
object bounces back and hurts the most
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7
system of interest; isolated
momentum is conserved in collisions, if and only if, ALL colliding objects are considered to be part of the ________________________ __(A+B)__ and system is ______________ (no external forces are present)
po=pf or △p =0
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8
elastic collision
momentum is conserved; kinetic energy is conserved; objects bounce and there is no damage; examples: billiard balls, bumper cars (greater impulse leads to bounce)
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9
inelastic collision
momentum is conserved; kinetic energy is not conserved; objects bounce, damage or not; examples: any soft ball, real cars
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10
perfectly inelastic collision
momentum is conserved; kinetic energy is not conserved; objects stick, damage or not; examples: clay balls, railroad cars, real cars
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11
equals
if Ko ____ Kf, then the collision was elastic
if po ____ pf, then the collision is possible
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12
does not equal
if Ko ________ Kf, then the collision was inelastic
if po _________ pf, then the collision is not possible
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13
sound energy
kinetic energy can be lost and transferred into __________ because it takes an enormous amount of energy to make sound
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14
explosion
reverse collision
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15
conserved
collision is only possible/elastic when momentum is _____________
Studied by 3 people
