InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
How do you define force? What are the forces acting on a man standing in a lift? If the lift moves down with an acceleration of 2ms-2, what is the net force on the man if his mass is 50kg? |
|
Answer» Net force acting on a body is equal to mass into acceleration or we may define force as a push or pull which changes or tends to change the state of rest or of uniform motion in a straight line of the body on which it acts. The forces acting on a man in a lift are (i) weight of the man acting vertically downwards, (ii) the reaction of the floor acting vertically upwards. In a lift accelerating downwards the net force on the man is F = m(g – a) = 50(9.8 – 2) = 50 × 7.8 = 390N. |
|