Thread: Local lad killed by towball

Originally Posted by mark2

I thought the units of power are Watts??? (1 Watt = 1 Joule/second)

You are correct. It was late, that's my excuse

Originally Posted by Mr Whippy

No I am not pulling your leg.
I do understand all about Kinetic and potential energy.

What I didn't understand and still don't is how to interpret the formula.

Your original post had this,

Kinetic Energy (KE)= (1/2)m.v^2 Units are joules (or kg/sec^2)

Force = m.a Units are Newtons (or kg.m/sec^2)


Ok the (KE) means Kinetic Energy.

(1/2)m I assume means half the mass. Why is the 1/2 bracketed?

Now v is velocity and I have guessed that ^2 means squared.

What is the decimal point between m and v

Dave.

Dave,

The 1/2 was bracketed because I thought it would make it clearer that I was writing a fraction, I could have written 0.5 but it is seldom written as a decimal multiplier. Yes the 1/2 applies to the whole product of mass and velocity squared, so taking 1/2 the mass and multiplying it by the velocity squared will give you the correct result.

a dot in some circles can mean multiplication, I could have left it as 1/2mv^2 or 1/2 x m x v x v but thought that the x would get confused for a variable instead of the multiplier sign.

I should have gone to bed instead of thinking about Newton's Laws of motion.

When I went to school the equation would be written like this



When I was in year 8 at school we were sent home to watch man land on the moon on a black and white TV.

So this is why I couldn't understand the modern version, especially the dot between m&v.

Dave.

Originally Posted by Mr Whippy

When I went to school the equation would be written like this



When I was in year 8 at school we were sent home to watch man land on the moon on a black and white TV.

So this is why I couldn't understand the modern version, especially the dot between m&v.

Dave.

Sorry Dave, I can't believe you. The image you've displayed looks like a dry marker on a white-board. If you were going to school when Neil was walking on the moon one day on your B & W TV. Then the equation would have been written on a black-board (which were usually green) in chalk!

But I get your drift!

Diana

Originally Posted by Lotz-A-Landies

Sorry Dave, I can't believe you. The image you've displayed looks like a dry marker on a white-board. If you were going to school when Neil was walking on the moon one day on your B & W TV. Then the equation would have been written on a black-board (which were usually green) in chalk!

But I get your drift!

Diana

Black texta on a piece of paper.

Dave.

In my world we use * for multiplication to avoid confusion with x which, as you say, could be mistaken for a variable.

The . notation took me a couple of secs to work out and I assumed was old school.

I am wanting someone to point out in simple terms the flaw with the walking speed with snatch strap to pull someone out argument. The way I read that, if you vehicle was just a bit bogged then you could self recover with a snatch strap and a pair of shoes with good traction

Originally Posted by DiscoStew

I am wanting someone to point out in simple terms the flaw with the walking speed with snatch strap to pull someone out argument. The way I read that, if you vehicle was just a bit bogged then you could self recover with a snatch strap and a pair of shoes with good traction

Sure could.

If you weighed 2 tonne

The mass is doing the work so you better get down to maccas pronto

Ben

Originally Posted by Disco_Dan

its a tragic thing to have happened and as has been said before it stresses the use for common sence , rated recovery gear and points , i like to winch rather than snatch unless all that is needed is a gentle pull like a tow , also making sure there is nobody in close proximity to whats going on especially inside the car besides the 2 drivers.. i suppose hindsight is a wonderful thing. but things like this happening are going to quickly destroy whatever privilages we have left as offroad enthusiests im sure many will agree.. Just my 2 cents. Dan.

i agree with you Dan i paid more money for my warn winch than my recovery points and strap ,so why not use it if you got it ???????'shock loads from snatching are unbeleivable

at least i am getting my moneys worth and have control over the situation