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System Interactions and Changes Videos 15 videos

AP Physics 1: 1.1 System Interactions and Changes
196 Views

We wouldn't give away the answer to this AP Physics question, not for all the joules in the crown. Come back when you've got some actual jewels. Th...

AP Physics 1: 1.2 System Interactions and Changes
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AP Physics 1: 1.2 System Interactions and Changes. What is the total mechanical energy of the system?

AP Physics 1: 1.4 System Interactions and Changes
172 Views

AP Physics 1: 1.4 System Interactions and Changes. What is the change in linear momentum?

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AP Physics 1: 2.2 System Interactions and Changes 196 Views


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Description:

AP Physics 1: 2.2 System Interactions and Changes. What is the velocity of the stone at 12 seconds?

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Transcript

00:00

Thank you We sneak and here's your shmoop douceur brought

00:05

to you by game shows they're all fun and games

00:08

until well who are we kidding that's all they are

00:10

spun in games Check the following diagram Ernie is walking

00:14

around new york and suddenly finds himself on a game

00:16

show that tests the physics knowledge of random passers by

00:22

The host shows ernie the force time diagram above which

00:25

is based on the motion of a two kilogram stone

00:28

that rules across ah horizontal surface He asks what is

00:33

the velocity of the stone at twelve seconds and hear

00:37

potential answers Yeah all right well let's look at our

00:42

diagram here We're dealing with a force time diagram Anytime

00:46

we see force in time together like this we know

00:49

we're dealing with impulse Impulse equals force applied over an

00:56

interval of time and impulses equal toe linear momentum and

01:01

momentum Well it's the product of mass and velocity Right

01:05

To find the total impulse in a diagram like this

01:08

we need to calculate the area under the curve right

01:11

there We can make that easier by breaking the diagram

01:14

into two triangles and a rectangle like this Now we

01:18

only need the area for the first triangle and the

01:22

rectangle Since we need to know the velocity at twelve

01:25

seconds we could do a little old school geometry to

01:28

figure those out The area of the triangle is twenty

01:32

In the area of the rectangle is sixty giving us

01:37

a total impulse of lady Well now we can just

01:41

put the numbers we have into the equation in salt

01:43

for velocity with the impulse which is eighty equals two

01:47

kilograms times velocity When we do the math we see

01:50

that the velocity is forty meters per second making option

01:54

b the correct answer Just to be safe we'll be

01:57

sure to remember how to figure out impulse in case

01:59

wherever ambushed on the street by some physics crazed game 00:02:02.69 --> [endTime] show

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