Kinematics

Question 1

Linear Kinematics

Answer 1

Motion not considering outside forces

Question 2

Distance

Answer 2

Amount of positional change
A scalar quantity (lacks direction)

Question 3

Displacement

Answer 3

Distance an object moved from a reference point
Does not indicate how far an object traveled
A vector quantity having both magnitude and direction

Question 4

Speed

Answer 4

How fast an object is moving, nothing about the direction of movement
Scalar quantity
Only positive
Average speed = direction traveled over time

Question 5

Velocity

Answer 5

Involves direction as well as speed
Speed in a given direction
A rate of displacement (tells sign of velocity)
A vector quantity
Average velocity =displacement/time or s/t

Question 6

Acceleration

Answer 6

The rate of change of velocity
Increase is positive and decrease is slowing down
Average acceleration = final velocity - initial velocity divided by time

Question 7

Concavity

Answer 7

Concave up means positive acceleration
Concave down means negative acceleration

Question 8

Uniformly accelerated motion

Answer 8

For every second an object is in the air there is a uniform change in velocity
Air resistance is neglected
Objects accelerate at a uniform rate due to acceleration of gravity
Object projected upward will be slowed at the same uniform rate due to gravity

Question 9

Air resistance (Friction of air)

Answer 9

Lighter objects will be affected more, denser objects affected less
May stop accelerating and fall at a constant rate (all things reach this point eventually)

Question 10

Laws of uniformly accelerated motion

Answer 10

Distance traveled and downward velocity can be determined for any point in time
Time it takes to reach max height is equal to time it takes to fall back to ground

Question 11

Projectiles

Answer 11

Objects given an initial velocity and released
Follows a predictable path (parabola)
Gravity will negatively accelerate objects
Vertical affected by gravity
Horizontal not affected by gravity

Question 12

Projectiles (gravity influences)

Answer 12

Maximum horizontal displacement (long jumper, shot putter)
Maximum vertical displacement (high jumper, pole vault)
Accuracy (shooting in basketball or soccer)

Question 13

Vector of projectiles

Answer 13

Projective force and gravity

Question 14

Projectiles with horizontal velocity

Answer 14

Horizontal velocity projects the objects same distance from the release point

Question 15

Projectiles with vertical velocity (in the air)

Answer 15

Vertical velocity must be added
After the height of release

Question 16

Projectiles with vertical velocity (upward velocity)

Answer 16

Negative acceleration by gravity
Reach zero velocity
Accelerate towards the ground
At release point has the same velocity it was given at release

Question 17

Projectiles with vertical and horizontal velocities

Answer 17

Horizontal velocity remains constant
Vertical velocity subject to uniform acceleration of gravity

Question 18

Horizontal distance of a projectile

Answer 18

Depends on horizontal velocity and time of flight
Time of flight depends on max height reached
Governed by vertical velocity of the object at instant of release

Question 19

Magnitude of vectors for HDP is determined by?

Answer 19

Initial projection velocity vector
Angle of direction of this vectors

Question 20

Angular Kinematics

Answer 20

Similar to linear Kinematics
Angular relates to rotary
Equations similar just different units

Question 21

Angular displacement

Answer 21

Skeleton - system of levers rotating about fixed points when force is applied
Particles near axis have displacement less than those farther away

Question 22

Angular displacement units

Answer 22

Degrees - used most frequently
Revolutions - 1 revolution = 360 degrees = 2pi radians
Radians - 1 radian = 57.3 degrees
Required for most equations
Theta symbol for angular displacement

Question 23

Angular velocity

Answer 23

Rate of rotary displacement
The angle through which the radius turns divided by time

Question 24

Angular acceleration

Answer 24

Alpha symbol - the rate of change of angular velocity

Question 25

Relationship between linear and angular motion

Answer 25

All three have the same angular velocity
But linear velocity of the circular motion is proportional to the length of the lever

Question 26

If angular velocity is constant?

Answer 26

The longer the radius, the greater is the linear velocity of a point at the end of that radius
Reverse is also true:
If linear velocity is constant, an increase in radius will result in a decrease in angular velocity

Question 27

What if the radius of rotation decreases?

Answer 27

Linear velocity does change
Shortening the radius will increase the angular velocity, and lengthening it will decrease the angular velocity

Question 28

Is there direct proportionality between linear velocity and the radius?

Answer 28

Yes