BM - fluid mechanics in physical activity

Question 1

What is fluid mechanics?

Answer 1

the study of objects or bodies that travel through a fluid.

Question 2

What is, “human bodies or objects launched into the air that are subject to the forces of weight and air resistance only.”?

Answer 2

Projectile

Question 3

Define streamlining

Answer 3

shaping a body so that it causes the least drag when travelling through a fluid.

Question 4

What is an aeroplane wing an example of?

Answer 4

Aerofoil

Question 5

What is “a uniform curve that us symmetrical abouts its highest point”?

Answer 5

Parabola

Question 6

Define lift force

Answer 6

force that acts perpendicular to the direction of travel for a body moving through a fluid.

Question 7

Explain the angle of attack

Answer 7

the angle at which a projectile is tilted from the horizontal. Lift force will increase as the angle of attack is increased up to a certain point (17 degrees).

Question 8

Explain the bernoulli principle

Answer 8

states that molecules in a fluid exert less pressure the faster they travel and more pressure the slower they travel.

Question 9

What is an eccentric force?

Answer 9

force whose line of application passes outside the centre of mass of a body, causing the resulting motion to be angular.

Question 10

Explain the magnus effect?

Answer 10

It explains the deviation in flight paths of spinning balls in sport, especially tennis, golf, football, table tennis and cricket.