Question

A man pushes a metal block and fails to displace it. He does :

• A. maximum work
• B. no work at all
• C. positive work
• D. negative work

Answer 1

Answer:

B. no work at all

• Work =F.S cos𝝷 Where F is force and s Displacement . 

• Pushing a box across the floor is work, so is carrying a box.

• Holding a heavy box is NOT work because you need to use a force to move an object through a distance. Holding a box does not fulfil the distance requirement.

•  

  Walking up stairs or walking downstairs is work because you are moving.

• Getting out of bed in the morning and walking to the bathroom is work.