Force Work on 5kg Particle Moving at Constant Velocity

[Nickluvn]

Homework Statement

A particle with mass 5kg travels with a constant velocity of 5 m xˆ − 2 m zˆ while ss
subject to a force of 1Nxˆ − 5Nyˆ + 6Nzˆ . At what rate is this force doing work on the particle?

Homework Equations

w = fd

The Attempt at a Solution

I changed it into vector notation

so it kinda looked like [5,0,-2][x^ y^ z^] dot product with [1 , -5 , 6] [ x^ y^ z^]

the answer i got was 5 N*m/s x^ - 12 N*m/s z^

this correct?

 

[PhanthomJay]

Homework Statement

A particle with mass 5kg travels with a constant velocity of 5 m xˆ − 2 m zˆ while ss
subject to a force of 1Nxˆ − 5Nyˆ + 6Nzˆ . At what rate is this force doing work on the particle?

Homework Equations

w = fd

The Attempt at a Solution

I changed it into vector notation

so it kinda looked like [5,0,-2][x^ y^ z^] dot product with [1 , -5 , 6] [ x^ y^ z^]

the answer i got was 5 N*m/s x^ - 12 N*m/s z^

this correct?

Almost. Power and work are scalar quantities. They have no vector direction. They are either positive or negative values.

 

[Nickluvn]

So it would be -7 N*m/s?

 

[PhanthomJay]

So it would be -7 N*m/s?

That's what I get... 0r -7 watts...hmmm, negative power ...