Topic 6 Motion

Question 1

What is distance ?

Answer 1

Distance tells us how far an object moves , does not involve direciotn .
-As it has magnitude and direction its a scalar quanitty .
(total distance travelled by car is 500m) .

Question 2

What is displcement ?

Answer 2

Displacement tells us the distance an object moves in a striaght line , from start poin tto finish point .
Displacement must include the direcion of a straight like
(displcement was 380m East )
-Displacement is therefore a vector qunity as it ha smagnitude and direction .
-

Question 3

Hwo do work out speed ?

Answer 3

Speed = disance /time
d/s*t triangle

speed =m/s
disance=m
time=s
(in physics symbol fro speed V ,, and symbol for distance is S) .

Question 4

Some speeds you need to know .

Answer 4

Normal walking speed =1.5m/s
Runnign spped is 3m/s
cycling speed 6m/
squiggly line before as it roughly .

Question 5

What are the factors that effect speed ?

Answer 5

-A fitter person generally ahcieves a faster spped than unfit person .
Terrain - move more rapidly on flat ground than a hill .
-Distance travellled a long distance runner running faster at the tired as they less tired .

Question 6

More speeds you need to now

Answer 6

Car on mian road about 13m/s
Fast train in Uk
50m/s 
Cdurising aeroplane 250m/s 
all roughly
spped of sound 330m/s 
speed of sound faster on warmer days then on cooler dys .

Question 7

Speed of object rarely constant , so we calculte average speed over total length of journey .

Answer 7

-if object moves in striaght line represented as a distance time hrapgh .

Question 8

How do work out the speed of someone from a distance timegraph ?

Answer 8

Gradient of a graph is spped
gradient =disace travelled/time taken
Looka t example on shhet .

Question 9

What about line upward in slope ?

Answer 9

Tells us this object is cosntanly acceralting .

How to determine spped of this ,
draww a tangne t, and work out gradient , change in y /change in x

Question 10

What is the velocity of an object

Answer 10

-its spped in a given direction
(0bject dtraveling 20m/s just sayign speed)
-but if we say object is travelling 20m.s south stating itsvelocit
-includes magnitude and direction so i t vector .

Question 11

how do you work out velocity .

Answer 11

Sma ea spped 
speed=distance/time
bt also have direction too 
so south
do quesiton in bookk

Question 12

If an obbject is moving at a constant spped in a circle …

Answer 12

then its velocity is constanlty changing , eventhough its speed is constant . (Also includes objetcs moving in aprt of a circle (cornr).

Question 13

What is the acceleratoin of an object ?

Answer 13

Acceleration of an oobject tells us is change in velocity over a given in time .unit is M/S SQUAREDDD

Question 14

hOW DO YOU WORK OUT ACCLERATION

Answer 14

Accleration (m/s squared)=change in vlocity (m/s) /time taken(s)
Vchange in V /a*t TRIANGLE
Do quesiotn in sheet

Question 15

Wat does gradient of a velocity of a time grpah tell us

Answer 15

acceleraiton of an object .
Joriziontal line = consant velocioty
upwards ccelration
downwards decellertion
CHECK IF IT VELOCITY TIME GRAPH FIRST ON Y AXIS

Question 16

Total area under the graph ..

Answer 16

tells us distnce travelled in a speicifc direction (dispalcement )

-if a graph is curved like inbook
accelratoin and decerration are not cosntant .
COUNT THE SAURES an half saurd and times by the area of the squares thats your ddistance .

Question 17

What is the equation if the object is accelerating a a constant velocity ?

Answer 17

Vsquared-u2=2as
finalvvelcoity-initialvelocity=2as
do question in shet .

Question 18

Equation for final velocity

Answer 18

v2=u2+2as

Square root at end TO FIND FINAL BELOCITY

Question 19

If an object stopped accelreating

Answer 19

object stops accclerating and movign at constant velocity =terminal velocity .
-any object flowing through a fluid (sky diver goign thoruhg fluuid 0

terminal velcoty effected by force of frcition due to shape = lower terminal velocity .