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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: 2.5 System Interactions and Changes 171 Views


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Description:

AP Physics 1: System Interactions and Changes Drill 2, Problem 5. Which of the following measurements is needed?

Language:
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Transcript

00:02

All right here's your Shmoop du jour brought to you by skateboarders. They may

00:07

not want you to know it but they're actually physicists in training. Check [Skateboarder does a trick]

00:11

out the following diagram dude.. All right a ball rolls down the ramp shown above, a

00:16

group of students are tasked with measuring the total energy of the system. [Diagram of the experiment]

00:21

Which of the following measurements do they need, select two answers. And here

00:25

the options. (Quickly reads through the text) Well they're all kinds of

00:30

energy, potential energy, kinetic energy, nuclear energy and the most powerful of [Examples of the energy types are shown]

00:34

all sugared up little-kid energy! To find the total energy [Kids running round a garden]

00:39

of a system we need to take its potential energy and its kinetic energy

00:43

and add those up to show the total mechanical energy. Well we can see that

00:47

there's a relationship between these two forms of energy and in an isolated [Two people with 'potential energy' and 'kinetic energy' tshirts on]

00:51

system the total energy cannot change. It's called the law of conservation of energy

00:55

and even the best legal team in the world couldn't help us break that law. [Judge uses a gavel]

00:58

Now we know that if kinetic energy in the system increases the potential [People on a roller coaster]

01:03

energy has to decrease and vice versa. Well simplify this question which is

01:08

always our goal we can minimize the kinetic energy and maximize the [Big guy with 'potential energy' tattooed on his chest]

01:13

potential energy. So if we just focus on the potential energy of this system when

01:17

the ball is at the top of the ramp and isn't moving we can find the mechanical [Diagram of the ball at the top]

01:22

energy of the system. And the way to find potential energy is to multiply the mass

01:26

by the gravity by the height .We always know gravity so we're left with mass and [Potential energy equation]

01:31

height and hey isn't that what answers (B) and (C) look like, yep those are our

01:36

correct choices. We don't need to know the distance the ball travels and we [A baseball hits an apple and it explodes]

01:40

also don't need to know the acceleration of the ball so options (A) and (D) you're

01:44

just out of the running. Well we're not great at skateboarding so instead we're [Kid has fallen over and his skateboard hits him in the head]

01:47

going to go practice our favorite and safest extreme sport, freestyle couch sitting. [Guy sat on the sofa eating chips]

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