Question

what is the work done by a person in the following case s (a) the person is applying a force of 5 N to an object of 10kg and the object displace to a length 2m (b) the person is trying to move a brick wall of 100kg with a force of 100N but the wall is not moved at all ​

Answer 1

Given :

★ First case :

• Force = 5N
• Displacement = 2m

★ Second case :

• Force = 100N
• Displacement = zero

To Find :

Work done in both cases.

Solution :

⧪ Work done is defined as the product of force and displacement.

• It is a scalar quantity having only magnitude$.$
• SI unit : J (joule)

Formula : $\underline{\boxed{\bf{\orange{W=F\ d}}}}$

• W denotes work done
• F denotes force
• d denotes displacement

⧪ First case :

➠ W = F d

➠ W = 5 × 2

➠ W = 10 J

⧪ Second case :

➠ W = F d

➠ W = 100 × 0

➠ W = 0 J