Quick question for the lorry drivers

degen · 4 Mar 2008 at 17:56

fuel cut off.

therealnerd2 · 4 Mar 2008 at 18:00

degen said:
fuel cut off.

Right, so when the lorry's on a downhill at >56mph, there'll be no acceleration from the engine then right?

[TW]Fox · 4 Mar 2008 at 18:01

therealnerd2 said:
Right, so when the lorry's on a downhill at >56mph, there'll be no acceleration from the engine then right?

Correct.

When travelling down a hill with a 40 tonne load you don't need engine acceleration to gather speed..

4T5 · 4 Mar 2008 at 18:07

[TW]Fox;11228713 said:
Correct.

When travelling down a hill with a 40 tonne load you don't need engine acceleration to gather speed..

I cannot believe you've had to post that. Comedy Gold

therealnerd2 · 4 Mar 2008 at 18:11

Okey dokey.

So now explain to me again why the unladen lorry is going to go faster than the loaded one?

mjt · 4 Mar 2008 at 18:12

therealnerd2 · 4 Mar 2008 at 18:13

mjt said:
dude, have you ever studied physics?

it's called mavity

Ahh right. Sorry, i must be stupid.

Which falls faster on the moon, a feather or a cannonball?

therealnerd2 · 4 Mar 2008 at 18:14

mjt said:
the terminal velocity of a heavier object is going to be greater than that of a lighter object

Oh, so the lorry's at terminal velocity?

The heavier one goes faster than the light one now?

mjt · 4 Mar 2008 at 18:14

i misread your post, i thought you wanted to know why the heavier one went faster

4T5 · 4 Mar 2008 at 18:15

therealnerd2 said:
Ahh right. Sorry, i must be stupid.

Which falls faster on the moon, a feather or a cannonball?

Are you for Real, I Hope so as you are Superb

therealnerd2 · 4 Mar 2008 at 18:16

malc30 said:
Are you for Real, I Hope so as you are Superb

I try

therealnerd2 · 4 Mar 2008 at 18:17

mjt said:
i misread your post, i thought you wanted to know why the heavier one went faster

Essentially you are correct - the heavier one will go slightly faster due to decrease effect of wind resistance, but i'd guess that wasn't what most people were thinking, and it's not a big factor.

DannyDan · 4 Mar 2008 at 18:36

I've seen vans with blue LEDs in the windscreen too.

I thought it was illegal to show blue lights on the front of a vehicle?

Defcon5 · 4 Mar 2008 at 18:42

DannyDan said:
I've seen vans with blue LEDs in the windscreen too.

I thought it was illegal to show blue lights on the front of a vehicle?

I think its fine as long as the light source is not visible and its not flashing.

Peter Diffey · 4 Mar 2008 at 18:45

malc30 said:
So a 70 tonne loaded lorry will go down a hill the same speed as an empty lorry will it
Motors has brought me the laughs lately.

ROFL, funnier the fact that you think heavy items fall faster than lighter items.

Wang · 4 Mar 2008 at 19:00

malc30 said:
So a 70 tonne loaded lorry will go down a hill the same speed as an empty lorry will it
Motors has brought me the laughs lately.

Erm, as long as all external forces are the same, so say it is 2 identical lorries with one full trailer and one empty trailer, they will go at the same speed.

Pants · 4 Mar 2008 at 19:00

Peter Diffey said:
ROFL, funnier the fact that you think heavy items fall faster than lighter items.

Err.... the heavier item will roll down a hill faster... lol.

For example. My bike rolls down a hill at about 30 mph. My car will roll down that hill much faster.

[TW]Fox · 4 Mar 2008 at 19:01

I was more getting at the fact that the speed limiter on a truck doesn't apply the brakes and thus can be exceeded downhill.

therealnerd2 · 4 Mar 2008 at 19:02

[TW]Fox;11229156 said:
I was more getting at the fact that the speed limiter on a truck doesn't apply the brakes and thus can be exceeded downhill.

Don't worry, time on the forums will teach you how to read threads.

therealnerd2 · 4 Mar 2008 at 19:04

Pants said:
For example. My bike rolls down a hill at about 30 mph. My car will roll down that hill much faster.

Ahh crp, I got owned. Maybe you should try rolling down the hill yourself to just make sure eh?