Section 3 - Frictional Resistance

Question 1

Experiments have shown that frictional resistance accounts for _______ to _______ percent of the total resistance in slow-speed ships and as much as _______ percent in high-speed ships.

Answer 1

80 / 85 / 50

Question 2

Not only does the nature of the surface affect the drag, but the _________ and _________________ are also changed.

Answer 2

wake / propulsive performance

Question 3

_______________ is thus the largest component of the total resistance of a ship.

Answer 3

Frictional resistance

Question 4

Towards the after end of the long plank the water had acquired a forward motion and so had a _________ relative velocity.

Answer 4

lower

Question 5

For the smooth varnished surface, the value of the exponent n decreased from _________ for the short plank to _______ for the long plank.

Answer 5

2,0 / 1,83

Question 6

For the planks roughened by sand, the exponent had a constant value of ________.

Answer 6

2,0

Question 7

For a given type of surface, the f value __________ with increasing length, and for a given length, it __________ with surface roughness.

Answer 7

decreased / increased