Question

3. The SI unit of work or energy is joule. Explain why the work and energy have same SI unit.

4. A force of 25 N causes a displacement of 4 m in
its own direction. What is the magnitude of work
done?
[100 J]

5. A boy does a work of 800 J is dragging a sack of rice through a distance of 10 m. What is the magnitude of force applied by the boy?
[80 N]

6. A girl applies a force of 50 N, in pushing a table such that work done by her is 25 J. Calculate the displacement produced in the table.
[0.50 m]


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Answer 1

Answer:

3. Energy cannot be created or destroyed. It can only transfer.

We need energy to do any work. So that's the point which tell us that the SI unit is same.

4. W = F*S

   W = 25*4

   W = 100 N

5. W = F*S

   800 = F*4

   800/4 = F

   F = 800/4

   F = 200 N

6. W = F*S

   25 = 50*S

   S = 50/25

   S = 2m

Explanation:

4. W = F*S

   W = 25*4

   W = 100 N

5. W = F*S

   800 = F*4

   800/4 = F

   F = 800/4

   F = 200N

6. W = F*S

   25 = 50*S

   S = 50/25

   S = 2m

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