Question

18. Calculate the amount of a force required to move a body of mass 50 kg and cover a distance of 2 m​

Answer 1

Given Mass of the object m=50kg and displacement s=100m.

Now frictional force f=μN where μ=coefficient of friction and N= normal force

We know N=mg; where g=acceleration due to gravity =10 m/s

2

N=50×10=500N.

Thus frictional forcef=500μ

Again work done by frictional forceW

f

=fscosθ where s= displacement =100 m and θ=0

0

ThereforeW

f

=500μ×100=50μkJ

Answer 2

F=MgH

M=50kg

H=2m

g=10m^-2

F=50×10×2=1000

answer=1000