Kinetic Concepts (Chapter 4)

Question 1

General motion

Answer 1

combination of both linear and angular motion

Question 2

Linear Motion

Answer 2

occurs when all body parts are moving at the same speed in the same direction along a curved or straight line

Question 3

Rectilinear

Answer 3

linear motion in a straight line

Question 4

Curvilinear

Answer 4

linear motion in curved line

Question 5

Distance

Answer 5

the path travelled from start to finish, regardless of direction

Question 6

Displacement

Answer 6

change of position - how far it is from the initial position to the final position

Question 7

Speed

Answer 7

the ratio of distance covered to time taken

Question 8

Speed equation

Answer 8

distance / time

Question 9

Velocity

Answer 9

change in position

Question 10

Velocity equation

Answer 10

displacement / time

Question 11

Acceleration

Answer 11

change in velocity in a given period of time

Question 12

Acceleration equation

Answer 12

change in velocity / change in time

Question 13

Zero acceleration

Answer 13

no longer speeding up or slowing down, at a constant state of motion

Question 14

Angular motion

Answer 14

rotation around a central axis or fixed point

Question 15

Torque

Answer 15

the tendency of an object to rotate

Question 16

Size of torque

Answer 16

• length of lever arm

- size of applied force

Question 17

Eccentric Force

Answer 17

causes angular motion

Question 18

Angular distance

Answer 18

covered by rotating body, sum of all angular changes the body undergoes

Question 19

Angular displacement

Answer 19

the difference between the initial and the final angular position of an object

Question 20

Angular speed

Answer 20

the angular distance covered divided by the time taken to complete the motion

Question 21

Angular velocity

Answer 21

rate of change of the angular displacement of a body over time

Question 22

Relationship between linear and angular velocity

Answer 22

linear velocity = radius of rotation x angular velocity

Question 23

Angular acceleration

Answer 23

rate of change of angular velocity

Question 24

Change angular acceleration

Answer 24

changing size or direction of the acceleration

Question 25

Projectile motion

Answer 25

an object or body that is launched into the air and affected only by the forces of gravity and air resistance can be considered a projectile

Question 26

Vertical component

Answer 26

influenced by gravity and the vertical component of the initial projection velocity

Question 27

Horizontal component

Answer 27

affected by air resistance and relates to horizontal distance covered by projectile

Question 28

Factors affecting the path of projectile

Answer 28

• angle of release
• height of release
• speed of release

Question 29

Angle of release

Answer 29

the angle at which an object is projected into the air

Question 30

Optimal Angle

Answer 30

45 degrees

Question 31

Speed of release

Answer 31

the speed at which an object is kicked, thrown or propelled into the air

Question 32

Optimal speed of release

Answer 32

greater speed of release = greater horizontal range

Question 33

Height of release

Answer 33

the difference between the height at which a projectile is released and the height at which it lands or stops

Question 34

When height of release is zero

Answer 34

projection height equals landing height, optimal angle of release is 45 degrees

Question 35

when height of release greater than zero

Answer 35

projection height is greater than the landing height, optimal angle is less than 45 degrees

Question 36

when height of release less than zero

Answer 36

projection height is less than landing height, optimal angle is greater than 45 degrees