Lecture 11

Question 1

What is buoyancy?

Answer 1

Upward force that opposes gravity,a pressure difference that causes a net upward force

Question 2

Buoyancy aids

Answer 2

Lungs and swimbladders contain air helping animals float

Question 3

Forces involved with underwater swimming:

Answer 3

Thrust,drag,lift and weight

Question 4

Mechanisms for moving forward

Answer 4

Whole or fin undulation,Fins,flukes or oars or jet propulsion

Question 5

What is undulatory swimming?

Answer 5

wave like motions propelling an animal forward

Question 6

What is partial undulatory swimming?

Answer 6

Only using certain parts of the body to make waves

Question 7

What are undulating fins?

Answer 7

using fins to make wave movements eg seahorse

Question 8

What is jet propulsion?

Answer 8

Ejecting fluid at high frequencies to move forward (this isnt energy efficient)

Question 9

Waves

Answer 9

incur a drag penalty making swimming harder

Question 10

What is porpoising

Answer 10

Movement above the water