PowerPoint Chapter 10

Question 1

What is a projectile?

Answer 1

A body whose motion is subject only to the forces of gravity and fluid resistance

Question 2

All projectiles exhibit ____, ____, or ____ motion ?

Answer 2

All projectiles exhibit linear, rotary, or general motion

Question 3

The human body is a complex____ ____?

Answer 3

The human body is a complex kinetic chain

Question 4

How does motion from the kinetic chain occur?

Answer 4

Kinetic Chain
Motion as a result of force applied by the distal segment of a kinetic chain
(Simple (1seg) or complex (2+ seg) chains)

Question 5

What are the three keys to utilizing the kinetic chain in projectiles?

Answer 5

Involving the entire body
Distal segment is free to move and often with great mobility
Transmitting force up to the point of release

Question 6

The human body becomes a ____ during the airborne phase of a jump?

Answer 6

The human body becomes a projectile during the airborne phase of a jump

Question 7

What is Newton’s law of universal gravitation?

Answer 7

Law of attraction. Two bodies are attracted to one another with force

Question 8

Gravity is constant at ____m/s2 regardless of ____, ____, or ____ of the projectile?

Answer 8

Gravity is constant at 9.81 regardless of size, shape, or weight of the projectile

Question 9

Vertical projectile has the same ending velocity as initial but reaches ____ at the apex?

Answer 9

Vertical projectile has the same ending velocity as initial but reaches 0 at the apex

Question 10

Velocity ____ on the upward ascent. And ____ on the fall due to Gravity?

Answer 10

Velocity decreases on the upward ascent. And increase on the fall due to Gravity

Question 11

Every projectile has ____ and ____Components that are easier to analyze separately?

Answer 11

Every projectile has Horizontal and Vertical Components that are easier to analyze separately

Question 12

The vertical component of a projectile is influenced by what?

Answer 12

Gravity

Question 13

The horizontal component of a projectile is related to what?

Answer 13

Horizontal – (not influenced by Gravity). Relating to distance traveled by projectile

Question 14

Projectiles with some horizontal component follow a ____ ____ ____?

Answer 14

Projectiles with some horizontal component follow a predictable parabolic path

Question 15

What is a parabola?

Answer 15

Parabola – Curved symmetrical shape

Question 16

What three things does the path of a projectile depend on?

Answer 16

Angle of projection
Projection Velocity
Projection Height

Question 17

The horizontal and vertical components of projectile velocity. Notice that the horizontal component is ____ and the vertical component is constantly ____.

Answer 17

The horizontal and vertical components of projectile velocity. Notice that the horizontal component is constant and the vertical component is constantly changing.

Question 18

Vertical projectiles have the same ending ____ as initial but reaches ____ at the apex?

Answer 18

Vertical projectiles have the same ending velocity as initial but reaches 0 at the apex

Question 19

Velocity decreases on the ____ ascent and increases on the ____ ____ due to gravity

Answer 19

Velocity decreases on the upwards ascent and increases on the fall down due to gravity

Question 20

What is the angle of projection?

Answer 20

Angle of projection
-Responsible for the shape of projectile trajectory
-Shape solely dependent on angle

Question 21

What is the projection velocity?

Answer 21

Projection Velocity
Determines length or size of projectile trajectory

Question 22

What is relative height of projection?

Answer 22

Relative height of projection
-Difference in height from initial projection and height at which object lands or stops

Question 23

What affects the flight of a projectile before release?

Answer 23

Angle projection
Projection velocity
Relative height of projection

Question 24

What factors affect the projectile after release?

Answer 24

Gravity
Fluid resistance

Question 25

Shape of trajectory(parabolic path) depends on relative sizes of ____ & ____components?

Answer 25

Shape of trajectory(parabolic path) depends on relative sizes of vertical & horizontal components

Question 26

An angle of 90 is a ____ trajectory?

Answer 26

Vertical

Question 27

An angle of 0-90 is a ____ or ____ trajectory?

Answer 27

Oblique or parabolic

Question 28

An angle 0 is a ____ trajectory?

Answer 28

Horizontal (½ a parabola )

Question 29

Rule of thumb Bigger Angle = more ____trajectory Smaller Angle = more ____ trajectory

Answer 29

Rule of thumb Bigger Angle = more vertical trajectory Smaller Angle = more horizontal trajectory

Question 30

____ Velocity or velocity at ____ determines Length and Size of Trajectory?

Answer 30

Initial Velocity or velocity at release determines Length and Size of Trajectory

Question 31

The combination of ____ and ____ of projection = Range

Answer 31

The combination of Speed and angle of projection = Range

Question 32

The combination of Speed and angle of projection = ____

Answer 32

The combination of Speed and angle of projection = Range

Question 33

What is range?

Answer 33

Range – the horizontal displacement of a projectile

Question 34

What is relative projection height?

Answer 34

Difference in start height and ending height

Question 35

Velocity being constant…. ____ ____ has the advantage

Answer 35

Velocity being constant…. Projection height has the advantage

Question 36

Longer flight time = greater ____ displacement

Answer 36

Longer flight time = greater horizontal displacement

Question 37

When look at a projectile, the interactions of what should be watched for?

Answer 37

Drag Lift

Question 38

What is drag?

Answer 38

Drag – Parallel, tend to resist an object through the fluid

Question 39

What is lift?

Answer 39

Lift – Perpendicular, tend to change the direction of system motion

Question 40

Rule of thumb: ____° angle is perfect mix of ____ and ____ forces > 45° = ____ ____ < 45° = ____ ____ ____

Answer 40

Rule of thumb: 45° angle is perfect mix of Vert and Horz forces > 45° = shorter range < 45° = loss of displacement

Question 41

What is accuracy?

Answer 41

Accuracy – horizontal displacement is the main goal: Range of optimal angle of projection narrows significantly

Question 42

Main Goal of Max Horz speed and displacement = Optimal angle tends to be ____ ____?

Answer 42

Main Goal of Max Horz speed and displacement = Optimal angle tends to be below 45°.

Question 43

Goal of Displacement/Vert Displacement & Speed = Optimal angle is ____ ____?

Answer 43

Goal of Displacement/Vert Displacement & Speed = Optimal angle is above 45°.

Question 44

What is the definition of the laws of uniformly accelerated motion?

Answer 44

Laws of uniformly accelerated motion: relate acceleration, displacement, time, and velocity in the condition of a constant gravitational acceleration -Derived by Galileo -These ideas apply directly to projectile motion

Question 45

What is the first law of uniformly accelerated motion?

Answer 45

vf = vi + at vf = final velocity vi = initial velocity a = the acceleration t = time This equation enables us to calculate a projectile’s velocity at any time, if initial velocity and a constant acceleration are known

Question 46

What is the second law of uniformly accelerated motion?

Answer 46

pfinal = pinitial + vi t + "a t2" /"2" pfinal = final position pinitial = initial position vi = initial velocity t = time a = acceleration This equation enables us to calculate the final position of a projectile with respect to initial velocity and acceleration.

Question 47

What is the third law of uniformly accelerated motion?

Answer 47

v2f = v2i + 2a(d) v2f = final velocity squared v2i = initial velocity squared a = the acceleration d = positionfinal – positioninitial This equation enables us to calculate the final velocity of a projectile with respect to acceleration and displacement.

Question 48

What are the variables in uniformly accelerated motion?

Answer 48

Variables: Velocity, Acceleration, Displacement, Time

Question 49

The uniformly accelerated motion equations may be used to relate linear ____quantities whenever acceleration (a) is a constant, unchanging value.

Answer 49

Kinematic

Question 50

The 3rd law of uniformly accelerated Motion is best suited for ____ projection? v2f = v2i + 2a(d)

Answer 50

The 3rd law of uniformly accelerated Motion is best suited for Vertical projection v2f = v2i + 2a(d)

Question 51

What events must be considered when analyzing projections vertical distance?

Answer 51

Analyzing these events include consideration of : Gravity, Air resistance, Projection angle, Projection velocity, Projection height

Question 52

What assumptions are made when analyzing projections vertical distance?

Answer 52

-v2f = 0 Projectile at the apex is = zero -Acceleration caused by gravity is 9.81 m/s2 -Gravity acts downward making it neg 9.81 m/s2 -A projectile may not be perfectly vertical

Question 53

Total horizontal displacement of a projectile is called ___?

Answer 53

Range

Question 54

The ____ component of a projectile remains unchanged throughout trajectory?

Answer 54

The horizontal component of a projectile remains unchanged throughout trajectory.

Question 55

What is a simplified second law of uniformly accelerated motion?

Answer 55

d = vit d = horizontal displacement vi = initial horizontal velocity t = time of flight Distance = Rate x Time