I think I understand, but where do you find force?

[SammyS]

I got one by using v=at

Well what did you get?

 

[Laura0901]

I used F=ma so: F=(10,000kg)(1)= 10,000

 

[Laura0901]

Which I think is definitely wrong! I don't see how to use acceleration in the equation F=Mmg..

 

[SammyS]

I used F=ma so: F=(10,000kg)(1)= 10,000

Why is that wrong? (Except of course you left the units off.) 10,000 N

Now use you "friction" equation: F_f = μN = μmg.

 

[Laura0901]

10,000 N is the force?

 

[Laura0901]

I used that friction formula to get:
10000=M(10000)(9.8)

 

[SammyS]

10,000 N is the force?

That's the force required to stop a 10,000kg train in 30 seconds if it was traveling at 30 m/sec. Friction is the force that's employed to stop the train.

 

[Laura0901]

which equaled to .1020408163

 

[Laura0901]

Which doesn't have units because it's a coefficient

 

[SammyS]

which equaled to .1020408163

That seems reasonable.

In the future, try to use the "reply" feature to respond to a particular post.

 

[Laura0901]

Sorry. I'm using the web version on a device. I think I am using the Reply now!

 

[Laura0901]

Wait no I'm not. Well thank you SO MUCH for helping. You're amazing. Thanks for staying around and helping me even though I didn't understand at all

 

[stephen8686]

No problem. Glad you understand

 

[Laura0901]

Do you mind checking out my other question about checking my answers? If not it's okay.

 

[stephen8686]

Sure I have plenty of time

 

[Laura0901]

Thank you!

 

[stephen8686]

Wait where's your other question?

 

[Laura0901]

They deleted my question! Ugh! But it is okay. I got help from my teacher lol thanks anyways! :)