Question

a. What will be the work done when a force of 20 newton displaces an object 4 m in the same direction. State your answer in proper unit.

Answer 1

Given that:

• What will be the work done when a force of 20 newton displaces an object 4 metres in the same direction.

According to the statement:

• Force = 20 Newton
• Displacement = 4 metres

To calculate:

• The work done

Solution:

• The work done = 80 Joule

Knowledge required:

• When the force and displacement are in same direction then the work done is positive.

• When the force and displacement are in different direction then the work done is negative.

• SI unit of work done is N/m because the SI unit of force is Newton that is N and SI unit of displacement is metre that is m, when be combined then it be N/m

• But to the honour of scientist that do maximum work on it, the SI unit of work done be Joule

Using concept:

• Work done formula

Using formula:

• W = F × S

Where, W denotes work done, F denotes force, S denotes displacement.

Full solution:

→ W = F × S

→ W = 20 × 4

→ W = 80 J

→ Work done = +80 Joule $\:$

Answer 2

Explanation:

Given:-

Force=20N

Displacement=4m

To find:-

Work done

Solution:-

We know that

$\boxed{\sf Work=Force\times Displacement}$

• Substitute the values

$\\ \sf\hookrightarrow Work=20\times 4$

$\\ \sf\hookrightarrow Work=80Joules$

$\\ \sf\hookrightarrow Work=80J$