fluid mechanics

Question 1

what is fluid mechanics

Answer 1

the study of forces acting on a body travelling through air or water

Question 2

what are drag and air resistance classed as

Answer 2

dynamic fluid forces

Question 3

what is drag

Answer 3

the resistance, caused by the motion of a body travelling through a fluid (air/water)

Question 4

what is air resistance

Answer 4

acts on a body travelling at high velocity through the air, e.g. (cyclist)

Question 5

what are the types of drag

Answer 5

• form drag
• surface drag

Question 6

what is form drag

Answer 6

the resistance, caused by an objects shape (cross sectional area) and profile as it moves through a fluid

Question 7

what is surface drag

Answer 7

the resistance caused by an objects surface texture as it moves through a fluid.

Question 8

what factors affect the magnitude of air resistance and drag

Answer 8

• velocity
• frontal cross sectional area
• streamlining and shape
• surface characteristics

Question 9

what is the Bernoulli principle

Answer 9

• lift force is a force that acts perpendicular to the direction of travel
• this is achieved by the differences in air pressure around the object.
• molecules exert less pressure the faster they travel and more pressure when they travel slower
• molecules move from a high to low pressure

Question 10

what can be said about the frontal cross - sectional area

Answer 10

• the larger the area, the greater the air resistance or drag

Question 11

what is streamlining

Answer 11

the creation of smooth air flow around an aerodynamic shape

Question 12

what are projectiles

Answer 12

things or objects, that travel through the air e.g. tennis ball, javelin

Question 13

what are the three factors that affect the horizonal distance (horizontal displacement) that an object travels.

Answer 13

• speed of release
• angle of release
• height of release

Question 14

When the release height is the same as the landing high the release angle is?

Answer 14

release angle should be 45 degrees

Question 15

When the release height is above the landing height, you should release at an angle

Answer 15

release at an angle, that is less than 45 degrees

Question 16

When the release height is below the landing height, the release angle should be

Answer 16

greater than 45 degrees

Question 17

how does velocity (speed of release) effect horizontal distance

Answer 17

an increase in velocity, increases the horizontal distance that a projectile flies.,

Question 18

how does the height of the release affect the horizontal distance

Answer 18

a higher release height increases the horizontal displacement of a projectile

Question 19

what other factors effect flight

Answer 19

• weight
• air resistance

Question 20

analyse the factors affecting the flight path of the shot put and how an athlete can maximise horizontal displacement.

Answer 20

• Horizontal displacement is the shortest distance from the starting point to the end point.
• The angle or release will have an impact.
• The speed of release will have an impact.
• The height of release.
• Due to the landing heigh being less than the release height, so the ideal angle of release is less than 45 degrees.
• Due to having a heavier mass it will not get effect air resistance, thus meaning that it is a parabola flight path.
• Use their full body wight to generate maximum force (moving across the circle)
• The factors only matter if the technique is perfect and they have the right amount of type 11x glycolytic muscle fibres, in order to maximise the distance that the shot put is able to travel.
• The greater the velocity and the greater the height of the releases, means that there will be a greater horizontal displacement.
• Angle of release should be less than 45 degrees.
• The technique of the shot putter will also effect the optimum release angle and height.
• Release the shot at the highest point of the shot, in order to maximise the horizontal displacement.