Q3 of 28 Page 68

In case of negative work the angle between the force and displacement is

Work done = force. Displacement.


Since the work is negative hence it means.


-W = F.s. cosθ


-W= Wcosθ


-1 = cosθ


θ = 180°

More from this chapter

All 28 →
1

When a body falls freely towards the earth, then its total energy

 2

A car is accelerated on a labeled road and attains a velocity 8 times of its initial velocity. In this process the potential energy of the car

 4

An iron sphere of mass 11 kg has the same diameter as an aluminum sphere of mass is 35 kg. Both spheres are dropped simultaneously from a tower. When they are 10 m above the ground, they have the same

 5

A girl is carrying a school bag of 5 kg mass on her back and moves 300 m on a levelled road. The work done against the gravitational force will be (g =10 m s–2)