bernoulli principle

Question 1

define the bernoulli principle

Answer 1

the higher the velocity of air flow the lower the surrounding pressure

Question 2

draw an airflow diagram for a discuss

Answer 2

Question 3

explain an upward lift force of a discuss

Answer 3

• air travels faster over the top of the discuss and has a lower pressure
• air travels slower underneath the discuss and has a high pressure
• therefore creates an upwards lift force
• this enables the discuss to stay in the air for longer therefore increasing the horizontal distance it travels
• angle of attack is the tilt of a projectile relative to the airflow 17 degrees

Question 4

what happens to the discuss if the angle of attack increases too much

Answer 4

the discuss will stall or drop back down to the floor sooner shortening the horizontal distance it travels

Question 5

draw a free body diagram for a discuss

Answer 5

Question 6

draw a resultant force diagram for a discuss

Answer 6

Question 7

draw a diagram of the flight path a discuss travels

Answer 7

Question 8

draw a diagram for a downward lift force on an f1 spoiler

Answer 8

Question 9

explain a downward lift force acting on an f1 spoiler

Answer 9

• spoiler bar acts as an inverted aerofoil forcing air underneath to travel a further distance
• this increases the velocity of air flow underneath the car and below the spoiler bar creating a low pressure
• so pressure abov the spoiler is high as air travels at a slow velocity over the top of the spoiler
• a pressure gradient forms a downward lift force which pins the car to the track
• by increasing friction between the tires and the track so the car can maintain high speeds around tight corners

Question 10

draw an airflow diagram for a cyclist

Answer 10

Question 11

explain the downward lift force that acts on a cyclist

Answer 11

• the seat of the bike and the low handlebars create an inverted aerofoil forcing air underneath to travel a further distance
• this increases the velocity of air flow underneath the bike creating a low pressure
• so pressure above the bike is high as air travels at a slow velocity
• a pressure gradient forms a downward lift force which pins the bike to the track
• by increasing friction between the tires and the track so the bike can maintain high speeds around tight corners

Question 12

which sporting examples will you need to be able to descirbe an upward lift force for

Answer 12

discuss, javelin and skk jumper