Calculating Work Done on a Wooden Block Resting on Surface PQYX

In summary, a wooden block of mass 1.2 kg with dimensions 20cm x 10 cm x 10cm is resting on the surface PQYX with base area 10cm x 10 cm . The work done to enable it to rest on the surface is the gain in potential energy. If the block is not moving, then what's the displacement?
  • #1
thereddevils
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0

Homework Statement



A wooden block of mass 1.2 kg with dimensions 20cm x 10 cm x 10cm . It's resting on the surface PQYX (with base area 10cm x 10 cm , the vertical side would be 20cm in this case).What is the work done to enable it to rest on surface PQYX

Homework Equations





The Attempt at a Solution



On first thought , work done is simply the gain in potential energy ,

mgh=(1.2)(10)(0.2)=2.4 J

but that isn't the answer .
 
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  • #2
In my understanding, there is no work done if the box is not moving.
You can say that the forces are balanced... that the frictional force acting up the slope is equal in magnitude to the component of the box's weight pointing down the slope, but as Work = (Force) x (distance in direction of the force), my understanding is that no work is done if the box remains steady.
 
  • #3
Hi thereddevils! :smile:
thereddevils said:
A wooden block of mass 1.2 kg with dimensions 20cm x 10 cm x 10cm . It's resting on the surface PQYX (with base area 10cm x 10 cm , the vertical side would be 20cm in this case).What is the work done to enable it to rest on surface PQYX

I don't understand …

is the block tilted? …

and where is the block moving from and to? :confused:
 
  • #4
tiny-tim said:
Hi thereddevils! :smile:


I don't understand …

is the block tilted? …

and where is the block moving from and to? :confused:

sorry , i should hv posted the complete question.

Figure 23 shows a wooden block of mass 1.2 kg with dimensions 20cm x 10 cm x 10cm . It's resting on the surface PQRS . What is the workdone to enable it to rest on the surface PQYX ?

PQRS is of base area (20 x 10) and PQXY (10 x10)

THe block is neither moving nor its tilted .
 
  • #5
Well, work done is force "dot" displacement …

if nothing has moved, then what's the displacement? :confused:
 

What is work and how is it calculated?

Work is the measure of energy transferred when a force is applied to an object and causes it to move. It is calculated by multiplying the force applied by the distance the object moves in the direction of the force.

What is a wooden block and why is it used in this calculation?

A wooden block is a common object used in scientific experiments due to its stability and availability. It is used in this calculation to represent a simple object that is resting on a surface and can be easily moved by a force.

What does the surface PQYX represent in this calculation?

The surface PQYX represents the horizontal surface on which the wooden block is resting. It is used to determine the distance the block moves when a force is applied.

How do you calculate the work done on a wooden block resting on surface PQYX?

The work done on a wooden block resting on surface PQYX can be calculated by multiplying the force applied to the block by the distance it moves on the surface in the direction of the applied force.

Does the weight of the wooden block affect the work calculation?

Yes, the weight of the block is a factor in the calculation of work. The weight of the block is the force applied to it due to gravity, and it must be included in the overall force applied to the block in the calculation.

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