11 HMS - Biomechanics: Fluid Mechanics

What is fluid mechanics concerned with?

• Properties of solids

• Properties of gases and liquids

• Properties of metals

• Properties of light

What happens if the average total body density is higher than that of water?

• The body floats

• The body sinks

• The body remains suspended

• The body evaporates

Where is the centre of gravity generally found in the human body?

• Head

• Feet

• Waist

• Hands

What must a swimmer do to maintain the ability to float?

• Relax all muscles

• Contract abdominal muscles

• Extend arms and legs

• Increase body density

What is the force that opposes the forward motion of a body or object, reducing its speed or velocity?

• Lift

• Drag

• Thrust

• Gravity

Which of the following techniques helps a swimmer reduce drag?

• Keeping the body unaligned

• Engaging the core muscles

• Bending the knees excessively

• Keeping the toes unpointed

What is the role of lift in swimming?

• To slow down the swimmer

• To propel the swimmer forward

• To increase water resistance

• To decrease buoyancy

How can a swimmer maintain a streamlined position?

• By bending the knees

• By keeping the head in a neutral position

• By spreading the arms wide

• By lowering the hips

What is the primary factor that determines whether an object will float or sink in water?

• Temperature of the water

• Density of the object

• Shape of the object

• Color of the object

Which body position is most effective for reducing water resistance while swimming?

• Curved position

• Diagonal position

• Vertical position

• Horizontal position