projectile motion + Bernoulli's principle

Question 1

What is a projectile

Answer 1

A body that is launched into the air losing contact with the ground surface

Question 2

What is projectile motion

Answer 2

Movement of a body through the air following a curved flight path under the force of gravity

Question 3

What is a free body diagram

Answer 3

Shows all the forces acting on a body at a particular time

Question 4

What are the forces that affect projectile motion

Answer 4

• Speed of release
• Angle of release
• Height of release
• Aerodynamic factors

Question 5

How does the speed of release affect projectile motion

Answer 5

• Horizontal distance is primarily affected by the speed of release
• The greater the outgoing speed of projectile,the further it travels

Question 6

How does the angle of release affect projectile motion

Answer 6

Depends on the apex

Question 7

How does height of release affect projectile motion

Answer 7

1) Positive relative release height=Release height above landing-optimal AoR is <45 degrees because of an increased time of flight due to increased HoR
2) Negative relative release height
-Release below landing-optimal angle of release is >45 degrees as projectile needs increase time of flight to overcome obstacle

Question 8

What is a parabol

Answer 8

A uniform curve symmetrical about it’s highest point (apex)

Question 9

What is a parabolic flight path

Answer 9

A flight path symmetrical about it’s highest point caused by dominant weight force of a projectile
e.g. shotput

Question 10

What is a non parabolic flight path

Answer 10

A flight path asymmetrical about its highest point caused by the dominant force of air resistance on the projectile
e.g. shuttlecock

Question 11

What does a free body diagram show

Answer 11

• Forces that are acting
• Where the focus originates from
• Relative sizes

3 phases are start,mid,end

Question 12

What are parallelogram of forces

Answer 12

Illustrates the theory that a diagonal drawn from the point where forces are represented in the size and direction shows the resultant force acting

Question 13

What is the resultant force

Answer 13

The sum of all forces acting on a body or the net force acting on the projectile

Question 14

What happens if weight is dominant to air resistance

Answer 14

Flight path is parabolic

Question 15

What happens if air resistance is dominant to weight

Answer 15

Flight path is non parabolic

Question 16

What is bernoulli’s principle

Answer 16

The creation of additional lift force on a projectile in flight resulting from bernoulli’s conclusion that the higher the velocity of airflow,the lower the surrounding pressure

Question 17

What is a lift force

Answer 17

An additional force created by a pressure gradient forming on opposing surfaces of an aerofoil moving through a fluid

Question 18

How does air move around an aerofoil

Answer 18

1) As an aerofoil moves through the air it is forced to part and flow at different velocities above and below the projectile to meet behind at the same time
2) This affects the pressure of airflow above and below the aerofoil;forming a pressure gradient
3) Air moves at a higher velocity on the upper surface which means a low pressure
4) Air moves at a lower velocity on the underneath surface which means a higher pressure
5) This produces a lift force