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AP Physics 1 Videos 69 videos

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AP Physics 1: 3.5 Object Interaction and Forces 184 Views


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Description:

AP Physics 1: 3.5 Object Interaction and Forces. Which of the following quantities would need to be known in order to calculate the impulse of the collision?

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Transcript

00:00

Thank you We sneak and here's your shmoop du jour

00:05

brought to you by impulse To be clear we're talking

00:08

about impulse in physics not about that sweater We shouldn't

00:11

have bought a wooden block and a rubber wall collide

00:15

which of the following quantities would need to be known

00:19

in order to calculate the impulse of the collision It's

00:23

like two answers right near the options All right well

00:29

in physics impulses the transfer of mo mentum from one

00:32

object to another Think of a game of pool when

00:35

we strike the cue ball with the stick there's a

00:37

transfer of mo mentum like here to here when the

00:40

cue ball strikes another ball well that's another transfer of

00:43

mo mentum each collision is an impulse where the force

00:47

of one object delivers momentum to another object over a

00:50

given period of time Impulses defined his force times the

00:54

change in time equation looks like this because we're good

00:58

physics students way know that force equals mass times acceleration

01:02

right We just know that And since we're great physics

01:05

students problem we know that acceleration equals velocity divided by

01:10

time Write a will overtake Now the force equation can

01:14

live like this force equals mass times the quotient of

01:18

velocity divided by time And while we're having fun with

01:21

equations that means that if we multiply both sides by

01:24

time we'll see that force times time equals mass times

01:27

velocity In other words the impulse of force times time

01:31

equals mo mentum and that means we don't need to

01:34

know the coefficient of friction of the surface The block

01:37

is sliding on and we also don't need to know

01:40

the kinetic energy of the block The options being dear

01:43

incorrect to things We need no r a the mass

01:46

of the block and see the change in its velocity

01:49

That's it way also need to know if the place

01:51

were bought This sweater from takes returns because this thing's 00:01:54.516 --> [endTime] just titties

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