Two wooden boxes A and B of same dimensions are kept on the floor.Box A has iron bolts where as B is empty.Which of the two will experience more friction? *
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The FBD for the box of mass m when put on the table is,
The normal force N
1
is equal to the weight of the box.
N
1
=mg
The FBD of the first box when an identical box of mass m is placed above it is,
The normal force N
2
is equal to the weight of the second box.
N
2
=mg
The normal force N
3
is equal to the combined weight of the boxes.
N
3
=2mg
Clearly, N
1
=N
2
<N
3
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