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LEFT CLICK OR PRESS SPACE BAR TO ADVANCE, PRESS P BUTTON TO GO BACK, PRESS ESC BUTTON TO END COMPUTER PRESENTATIONS FOR KS3 SCIENCE - PHYSICS ©2003, STEVE PARKER

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COMPUTER PRESENTATIONS FORKS3 SCIENCE - PHYSICS

©2003, STEVE PARKER

COMPUTER PRESENTATIONS FORKS3 SCIENCE - PHYSICS

©2003, STEVE PARKER

11

KS3 SCIENCE- PHYSICS

KS3 SCIENCE- PHYSICS

Velocity &AccelerationVelocity &

Acceleration

VELOCITYVELOCITY22

VELOCITYVELOCITY33

“Velocity” is the same thing asspeed - it measures howfast something is moving

“Velocity” is the same thing asspeed - it measures howfast something is moving

VELOCITYVELOCITY44

Velocity or speedis the distancetravelled in agiven periodof time, or

Velocity = Distance Time

Velocity or speedis the distancetravelled in agiven periodof time, or

Velocity = Distance Time

VELOCITYVELOCITY55

For example, if ahelicopter travels300 km in 2 hrsit travels at an

average speed of150 km per hr

For example, if ahelicopter travels300 km in 2 hrsit travels at an

average speed of150 km per hr

ACCELERATIONACCELERATION66

ACCELERATIONACCELERATION77

“Acceleration” is whenan object moves at an

increasing speed, gettingfaster and faster as it goes

“Acceleration” is whenan object moves at an

increasing speed, gettingfaster and faster as it goes

For example a spacecraft does not take

off at a steady speed,it gets faster and faster

For example a spacecraft does not take

off at a steady speed,it gets faster and faster

ACCELERATIONACCELERATION88

Acceleration ishow quickly youare speeding up

Acceleration = Change in Velocity Time

Acceleration ishow quickly youare speeding up

Acceleration = Change in Velocity Time

ACCELERATIONACCELERATION99

For example, ifa plane takes

100 seconds toreach a speed of

100 m per second, its speed increasesby 1 m per second

each second

For example, ifa plane takes

100 seconds toreach a speed of

100 m per second, its speed increasesby 1 m per second

each second

So acceleration is1 m per s per s

or1 m/s2

So acceleration is1 m per s per s

or1 m/s2

DISTANCE-TIME GRAPHSDISTANCE-TIME GRAPHS1010

1111

The 2 p.m. trainruns at 100 kphfrom London to

Birmingham,then 60 kph toManchester,

then 90 kph toNewcastle

The 2 p.m. trainruns at 100 kphfrom London to

Birmingham,then 60 kph toManchester,

then 90 kph toNewcastle

DISTANCE-TIME GRAPHSDISTANCE-TIME GRAPHS

1212

The 2 p.m. trainruns at 100 kphfrom London to

Birmingham,then 60 kph toManchester,

then 90 kph toNewcastle

The 2 p.m. trainruns at 100 kphfrom London to

Birmingham,then 60 kph toManchester,

then 90 kph toNewcastle

0

50

100

150

200

250

300

1400 1500 1600 1700

Dis

tan

ce f

rom

Lo

nd

on

Km

Dis

tan

ce f

rom

Lo

nd

on

Km

TimeTime

DISTANCE-TIME GRAPHSDISTANCE-TIME GRAPHS

0

50

100

150

200

250

300

1400 1500 1600 1700

BirminghamBirmingham

1313D

ista

nce

fro

m L

on

do

n K

mD

ista

nce

fro

m L

on

do

n K

m

TimeTime

ManchesterManchester

NewcastleNewcastle

On a distance-time graph

the steepnessshows how

fast distanceis changing,i.e. the speed

On a distance-time graph

the steepnessshows how

fast distanceis changing,i.e. the speed

DISTANCE-TIME GRAPHSDISTANCE-TIME GRAPHS

VELOCITY-TIME GRAPHSVELOCITY-TIME GRAPHS1414

VELOCITY-TIME GRAPHSVELOCITY-TIME GRAPHS1515Suppose that a boat is rowed

along a river at varying speedsSuppose that a boat is rowed

along a river at varying speeds

VELOCITY-TIME GRAPHSVELOCITY-TIME GRAPHS1616Suppose the crew warm up,row steadily, then ease up

Suppose the crew warm up,row steadily, then ease up

VELOCITY-TIME GRAPHSVELOCITY-TIME GRAPHS1717

A graph of speed againsttime would look like thisA graph of speed againsttime would look like this

0

5

10

15

20

25

0 1 2 3

Vel

oci

ty k

m/h

rV

elo

city

km

/hr

Time hrsTime hrs

VELOCITY-TIME GRAPHSVELOCITY-TIME GRAPHS1818

0

5

10

15

20

25

0 1 2 3

Vel

oci

ty k

m/h

rV

elo

city

km

/hr

Time hrsTime hrs

On a velocity-time graph, thesteepness shows how fast speedis changing, i.e. the acceleration

On a velocity-time graph, thesteepness shows how fast speedis changing, i.e. the acceleration

Warm

-up

Warm

-up SteadySteady Ease-up

Ease-up