Calculate the work done by the mover

In summary, the mover has moved a 85kg crate at a constant speed through a displacement of 3,1m. The coefficient of kinetic friction between the floor and crate is 0.22, so the mover has done work of 833N.
  • #1
raman911
130
0
1. Homework Statement
A mover pushes a 85kg crate along the floor at a constant speed through a displacement of 3,1m[E]. The coefficient of kinetic friction between the floor and crate is 0.22.
A) Calculate Fn and Fapp.
B] Calculate the work done by the mover.3. The Attempt at a Solution
Fg=mg
=85kg*9.8N/kg
Fg=833N
So Fn=Fg
but how can i find Fapp

B] w=183N*3.1m
w=567.3
 
Last edited:
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  • #2
The box is moving at a constant speed, what does that say about the sum of the forces on the box?
 
  • #3
please helpp....
 
  • #4
What does the word constant mean??
 
  • #5
arildno said:
What does the word constant mean??

not changing
 
  • #6
Yes, so what is the acceleration of the box? How can you use that to find the sum of all the forces?
 
  • #7
daniel_i_l said:
Yes, so what is the acceleration of the box? How can you use that to find the sum of all the forces?
So a=0
Fnet=0
Fnet=Fapp+Ff
Fapp=0-180
Fapp=180
is that right?
 
Last edited:
  • #8
[tex]Given[/tex]

[tex]m=0.2kg[/tex]
[tex]\Delta {h}_{1}=0.835m[/tex]
[tex]{v}_{1}=0m/s[/tex]

[tex]Required[/tex]

[tex]{E}_{g} and {E}_{k}[/tex]

[tex]Solution[/tex]

[tex]{E}_{g}={m}g\Delta h[/tex]
[tex]={0.2kg}*9.8N/kg*0.835m[/tex]
[tex]{E}_{g}=1.63J[/tex][tex]{E}_{k}=(1/2)m{v}_{1}^2[/tex]
[tex] =(1/2)0.2Kg(0m/s)^2[/tex]
[tex]{E}_{k}=0J[/tex]

[tex]{E}_{T}=1.56J[/tex]
 
Last edited:
  • #9
no response
 
  • #10
Where did you get the 180 from, and why did you cut out the sign in front of it?
 
  • #11
Your working seems ok, but I don't know where you got 180 from. Check your math...

Edit: Dammit, that's three times that's happened today :grumpy:
 
  • #12
Hootenanny said:
Your working seems ok, but I don't know where you got 180 from. Check your math...

Edit: Dammit, that's three times that's happened today :grumpy:

soory i mean 183
 
  • #13
I couldn't care less if the number was 54 or square root of pi fifths.

I want you to tell us:

1. HOW did you arrive at that number??

2. WHY did you take away the sign?
 

What is the definition of work in scientific terms?

In scientific terms, work is defined as the force applied to an object multiplied by the distance the object is moved in the direction of the force.

What is the formula for calculating work?

The formula for calculating work is W = F * d, where W is work, F is the force applied, and d is the distance the object is moved in the direction of the force.

What unit is work measured in?

Work is typically measured in joules (J) in the International System of Units (SI). However, in some other systems, it may be measured in different units such as foot-pounds or calories.

What is the difference between positive and negative work?

Positive work occurs when the force applied to an object is in the same direction as the object's displacement. Negative work occurs when the force applied is in the opposite direction of the object's displacement.

What are some real-life examples of work being done by a mover?

Some real-life examples of work being done by a mover include pushing a cart, lifting a box, pulling a sled, or carrying a heavy object. In all of these examples, the mover is applying a force to move an object over a distance, thus doing work.

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