1) A streamlined body structure helps in decreasing friction as it helps to move through fluids easily.
2)When two objects are pressed harder against each other, their irregularities lock tightly and increase the friction.
3)Grease acts as a lubricant that reduces friction by forming a layer between two surfaces in contact, thus preventing them from directly rubbing against one another.
4) A smooth surface has fewer irregularities and hence offers less friction.
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Similar Questions
Q1
Match the following
List I
List II
1
Streamlined body structure
a
Less no. of irregularities
2
Pressing two objects harder against each other
b
Lubricant
3
Grease
c
Increase friction
4
Smooth surface
d
Decrease friction
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Q2
Match the following
List I
List II
I. ∫1−1x|x|dx
(a) π2
II. ∫π20(1+log(4+3sinx4+3cosx))dx
(b) ∫a20f(x)dx
III. ∫a0f(x)dx
(c) ∫a0[f(x)+f(−x)]dx
IV. ∫a−af(x)dx
(d) 0
(e) ∫a0f(a−x)dx
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Q3
If∫42f(x)dx=12andf(6−x)=f(x),then∫42xf(x)dx=
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Q4
If ∫4−1f(x)dx=4 and ∫42[3−f(x)]dx=7then∫2−1f(x)dx=
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Q5
Match each of the items A, B, C with an appropriate item from 1, 2, 3, 4 and 5
(A) a1d2ydx2+a2ydydx+a3y=a4
(B) a1d3ydx3+a2y=a3
(C) a1d3ydx2+a2xdydx+a3x2y=0
(1) non-linear diferential equation
(2) linear differential equation with constant coefficients