Question

Medal/Fan! Help Please
A car, a train, a bicycle, and a skateboard are traveling at the same speed.
Which object has the greatest kinetic energy? (SC.6.P.11.1)
a. car
b. train
c. bicycle
d. skateboard

Answer 1

@Kainui @TheSmartOne

Answer 2

Do you know what kinetic energy is?

Answer 3

Its energy that a body posses by virtue of being in motion

Answer 4

Do you know the formula for kinetic energy?

Answer 5

No

Answer 6

well the formula is

\(\Large\rm Kinetic~Energy = \frac{1}{2} \times m \times v^2\)

\(\Large\rm Where:\\\ M~ is ~Mass \\\ V ~ is~ Velovity\)

Answer 7

Velocity**********

Answer 8

Oh so its the skateboard?

Answer 9

Before we jump to conclusions.. :)

We know that Velocity is a vector quantity and has both speed and direction.
What is something that is similar to velocity but is a scalar quantity?

A scalar quantity is something that has only speed. And no direction.

I have said the word twice so far ;)

Answer 10

Is it scalar quantity?

Answer 11

No I want to know a word that is the same thing like Velocity but is a scalar quantity.

Answer 12

The word is in your original question too :)

Answer 13

Speed?

Answer 14

Exactly!

Answer 15

and what does the question say about speed?

Answer 16

That there all going at the same speed

Answer 17

Exactly! So if they are all going at the same speed, then the letter v in the formula is a constant!

\(\Large\rm Kinetic~Energy = \frac{1}{2} \times m \times v^2\)

Answer 18

how do we figure out what v^2 is

Answer 19

We don't need to as velocity is the same thing as speed. And that v^2 will be the same thing for all 4 vehicles.

Answer 20

Now the only thing we need to worry about is the m.

Which of the 4 objects weighs the most?

Answer 21

The train

Answer 22

Exactly!

Answer 23

And that will be your answer!

Answer 24

Oh thank you for your help @TheSmartOne X)

Answer 25

Thank you for participating! @Hisokasbae
OpenStudy needs more users like you, who participate in their question so that they can learn something!
Keep on asking and answering questions!

~TheSmartOne

Answer 26

I am glad that I was able to help you :)

You can tag me next time or @iambatman .
He is the actual Physics master :)