Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

NUTR 384 > Exam 1: Chapter 2 > Flashcards

Exam 1: Chapter 2 Flashcards

1
Q

What is general motion?

A

It involves a combination of translational (linear) and rotational (angular) movement simultaneously. Most human movement is general motion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe Linear Motion.

A

Movement along a line that may be straight or curved, with all parts of the body moving in the same direction at the same speed.

-Ex: A sleeping passenger on a smooth airplane flight is being translated through the air.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Describe Angular Motion.

A

Movement involving rotation around a central line or point.

-Ex: A gymnast performing a giant circle on a bar, the entire body rotates, with the axis of rotation passing through the center of the bar.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are two other names for linear motion?

A

Translatory motion or translational motion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What are the two subcategories within linear motion?

A

Rectilinear Motion - along a straight line

-Ex: A motorcyclist maintaining a motionless posture as the bike moves along a straight path.

Curvilinear Motion - along a curved line

-Ex: A skier going over the crest of a hill, the motion is not linear because the top of the body is moving at a greater speed than lower body parts.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Here are some examples of general motion (a combination of both)

A

Ex: A football kicked end over end translates through the air as it simultaneously rotates around a central axis.

Ex: A runner is translated along by angular movements of body segments at the hip, knee, and ankle.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is one tool used to determine the position of an object or body?

A

Cartesian System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is distance?

A

The total amount of length traveled from A to B.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is displacement?

A

Strictly the length from A to B.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is speed?

A

Speed is the rate of motion.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is velocity?

A

Velocity is the rate of motion in a specific direction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Compare and contrast average speed and instantaneous speed.

A

Average speed - occurring over a designated time interval, the overall speed over a period

Instantaneous speed - occurring during a small interval of time, the speed at that specific point in time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Compare and contrast speed and velocity in terms of physics.

A

Speed - is a scalar quantity; it is defined as the distance covered divided by the time taken to cover it.

Velocity - is a vector quantity; it is defined as the change in position/displacement that occurs during a given period of time.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is acceleration?

A

It is defined as the rate of change in velocity over a given time internal.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What happens when acceleration is zero?

A

Your velocity will remain constant.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What does a positive acceleration value mean.

A

It can mean that you are speeding up OR down. It depends on the position.

17
Q

What is projectile motion?

A

It refers to objects moving in the air.

18
Q

What’s the only thing that can influence the path of a projectile?

A

Gravity (and air resistance, but we neglect that)

19
Q

What is a projectile?

A

A body in free fall that is ONLY subjected to the forces of gravity and air resistance.

20
Q

Describe the influences of the vertical and horizontal components of a projectile.

A

The vertical component is always influenced by gravity, whereas no force affects the horizontal component.

21
Q

Once a body or object has been projected into the air, what is constantly changing?

A

Its overall resultant velocity is constantly changing because of the forces acting on it.

22
Q

What remains constant for a projectile in motion, regardless of its size, shape, and weight.

A

The accelerative force of gravity towards the surface of the earth.

23
Q

What is the apex?

A

It is the highest point in the trajectory of a projectile.

24
Q

What can you say about the initial and final speed of an object that is thrown and caught at the same height?

A

If the object is caught at the same height from which it was tossed, the ball’s speed is exactly the same as its initial speed, although its direction is now reversed.

25
Q

What influences the horizontal component of a projectile?

A

Nothing. If the horizontal component of an object was released at 8m/s, it will remain that speed until it is stopped by some external force (gravity).

26
Q

What are three factors that can influence projectile trajectory?

A

Angle of projection.
Projection speed
Relative height of projection

27
Q

What is a trajectory?

A

The flight path of a projectile

28
Q

What is the angle of projection and how does it affect the trajectory of a projectile?

A

The angle of projection is the direction at which a body of object is propelled with respect to the horizontal.

29
Q

What are the three general shapes used to describe the angle of projection?

A

Perfectly vertical
Parabolic
Perfectly horizontal

30
Q

Explain a perfectly vertical and horizontal angle of projection.

A

Perfectly vertical - the projectile goes straight up and then straight down.

Perfectly horizontal - the projectile is thrown at an angle of zero degrees,it resembles ½ of a parabola.

31
Q

Explain a parabolic angle of projectile.

A

The projectile is thrown at an angle between 0° - 90° and the trajectory is shaped like a parabola. It has a symmetrical right and left halves.

32
Q

Explain what projection speed is and how it places a role in a projectile.

A

Projection speed is the magnitude of projection velocity.

Projection speed determines the length of size of a projectile’s trajectory.

33
Q

When you combine the projection speed and the angle of projection, what do you get?

A

You get horizontal displacement or known as the range.

Range is the horizontal displacement of a projectile at landing.

34
Q

What is the relative projection height and how does it place a role in a projectile?

A

The relative projection height is the difference between the projection height and the landing height.

The greater the relative projection height, the longer the flight time of the projectile, and the greater the range.

35
Q

In an event that involves a projectile, what two things do you want to maximize?

A

You want to maximize the speed of the projection and the release height.

36
Q

What factor is most important in a projectile sport?

A

The angle at which the projectile is thrown at. Known as the optimum angle of projection.

37
Q

What are the three conditions that vary for the optimum angle of projection?

A

If release height is zero, then angle is 45°.

If release height increases, then angle must decrease.

If release height decreases, then angle must increase.

38
Q

What is the horizontal velocity and acceleration of a projectile?

A

Velocity -> constant

Acceleration -> zero

39
Q

What is the vertical velocity and acceleration of a projectile?

A

Velocity -> constantly changing

Acceleration -> constant -9.81m/s2

NUTR 384 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions