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LEFT CLICK OR PRESS SPACEBAR TO ADVANCE, PRESS P BUTTONTO GO BACK, PRESS ESC BUTTON TO END
LEFT CLICK OR PRESS SPACEBAR TO ADVANCE, PRESS P BUTTONTO GO BACK, PRESS ESC BUTTON TO END
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
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