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Object Interaction and Forces Videos 13 videos
If there's one good thing about the heat death of the universe, it's that we'll all have an excellent excuse for dodging physics homework.
The real moral of the story here is just "don't get in the way of elephants or tigers." That is not the kind of kinetic energy you want to absorb.
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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?
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
Full Transcript
- 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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