Linear Motion

Question 1

Linear motion

Answer 1

• when a body or part moves in a straight or curved line
• with all its parts moving in the same distance, direction, time & velocity

Question 2

whole body examples of linear motion -

Answer 2

• toboggan
• ski jumper

Question 3

part of body examples of linear motion

Answer 3

• frame of bike & upper body of cyclist
• upper body/head of runner

Question 4

how is linear motion created

Answer 4

• when the forces line of application travels directly through the CoM of a body
• Called a direct force
• Causes linear motion

Question 5

example of how linear motion is created

Answer 5

• hitting a tennis ball in its centre will cause it to travel in a straight line
• with the same DDTV

Question 6

Distance

Answer 6

• length of the path taken by a body
• moving from 1 position to another

Question 7

Distance - units of measure

Answer 7

Metres (M)

Question 8

Displacement

Answer 8

shortest straight line route between 2 positions (start and finish)

Question 9

Displacement - units of measure

Answer 9

Metres (M)

Question 10

Speed

Answer 10

• movement of a body per unit of time (without reference to direction)

Question 11

Speed - calculation

Answer 11

distance/time

Question 12

speed - units of measure

Answer 12

Metres per second (m/s)

Question 13

velocity

Answer 13

the rate of change of displacement/speed in a given direction

Question 14

velocity - units of measure

Answer 14

metres/second

Question 15

acceleration/deceleration

Answer 15

rate of change of velocity/change in velocity in the time taken to make the change

Question 16

velocity - calculation

Answer 16

displacemment / time

Question 17

acceleration/deceleration - units of measure

Answer 17

Metres per second per second

Question 18

distance time graphs

Answer 18

• shows us the distance a body travels in a given time

Question 19

speed time graphs -

Answer 19

• shows us speed of a body that travels in a given time

Question 20

velocity time graphs -

Answer 20

• describe the same motion as a speed/time except has a negative axis

Question 21

what happens if the line crosses the X- axis in a velocity time graph

Answer 21

• indicates the body has changed direction

Question 22

in a velocity time graph, what indicates that a body has stopped -

Answer 22

• when line reaches x axis

Question 23

positive velocity

Answer 23

initial direction

Question 24

negative velocity

Answer 24

changed direction