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AP Physics 1 Videos 86 videos

AP Physics 1: 2.5 Changes and Conservation Law
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AP Physics 1: 2.5 Changes and Conservation Law. At what point(s) in this situation is energy lost in any form?

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AP Physics 1: 1.4 Changes and Conservation Laws
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AP Physics 1: 3.5 System Interactions and Changes 180 Views


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AP Physics 1: System Interactions and Changes Drill 3, Problem 5. Which of the following are true about the cart's motion?

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Transcript

00:00

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

00:05

Brought to you by grocery shopping while hungry Because when

00:09

else will we remember that we need twelve boxes of

00:11

cookies are checking falling graph Okay consider the graph of

00:16

a carts displacement Which of the following are true about

00:20

its motion will select two answers And here are the

00:22

options All right well this is definitely one of those

00:26

cards at the grocery store with that wheel that's all

00:28

wonky making it impossible to push All right well let's

00:32

look at our options Starting from the top Is the

00:34

force acting on the cart constant Well looking at this

00:37

graph it doesn't look very constant Tow us The velocity

00:40

is all over the place as we know velocity is

00:42

the rate of displacement overtime But this card is like

00:45

us after spending an hour studying physics It doesn't know

00:49

if it's coming or going so we can rule out

00:52

a in order for option b to be correct The

00:54

card has to be constantly gaining kinetic energy If the

00:58

graph showed the cart consistently going in one direction then

01:01

be would be right But we see the car goes

01:04

In reverse and goes forward than slows down and goes

01:07

in reverse again doesn't constantly gain kinetic energy at all

01:11

so we can throw be out as well For c

01:13

to be right the cart has to be going in

01:15

at least two different directions We can see that the

01:18

displacement or movement starts out negative then climbs into the

01:22

positive range So the movement is definitely in at least

01:25

three directions making option c one of the correct answers

01:29

And does the car have a net gain of kinetic

01:31

energy Well it ends up with a positive velocity after

01:35

starting from zero So yeah he is correct as well

01:38

Now that we got all that figured out we need

01:40

to go figure out where to hide all these cookies

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