Physics 2

1
Distance, speed and acceleration
Physics 2
Chapter 15
GCSE Additional Science
2
Distance, speed and acceleration
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1. Aled walks 200m in 40s. What is his speed?
2. Lowri travels 2km in 1000s. What is her speed?
3. How long would it take for Dafydd to run 100m if
   he runs at a speed of 10m/s?
4. Heledd travels at a speed of 50m/s for 20s. How
   far does she travel?
5. A car travels at a speed of 85 mph (about 40m/s).
   How long would it take for him to travel 20km?

1) 5m/s 2) 2m/s 3) 10s 4) 1000m/s 5) 500s
Chapter 15
GCSE Additional Science
3
Distance-Time Graphs
40 30 20 10 0




Motionless
Constant speed in reverse
Distance (metres)
Chapter 15
GCSE Additional Science
Time/s
20 40 60 80 100
Constant speed forwards (high)
Constant speed forwards (low)
4
40 30 20 10 0




Distance (m)
Time (s)
20 40 60 80 100
Chapter 15
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GCSE Additional Science

1. What is the speed during the first 20s?
2. How far is the object from the start after 60
   seconds?
3. What is the speed during the last 40s?
4. When was the object travelling at its fastest?

1) 0.5m/s 2) 40m 3) 2m/s in reverse 4) 40 60s
5
Speed v Velocity
Simply, speed is the distance travelled per
second
Velocity is the distance travelled per second in
a specific direction ..
Chapter 15
GCSE Additional Science
6
Acceleration

1. A biker speeds up from 0 to 10m/s in 5 s. What is
   the acceleration?
2. A ball is dropped with an acceleration of 10m/s2
   for 12s. By how much will the velocity of the
   ball change?
3. A car speeds up from 10 to 20m/s with an
   acceleration of 2m/s2. How much time did this
   change take?
4. A rocket speeds up from 1 000m/s to 5 000m/s in
   2s. What is its velocity?

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Chapter 15
1) 2m/s2 2) 120m/s 3) 5s 4) 2000m/s2
GCSE Additional Science
7
Velocity-Time Graphs
80 60 40 20 0
Constant acceleration




Constant deceleration
velocity (m/s)
Chapter 15
GCSE Additional Science
t(s)
10 20 30 40 50
Constant velocity
Constant acceleration (lower)
8
Calculating the Distance
80 60 40 20 0




Velocity (m/s)
t/s
Chapter 15
GCSE Additional Science
10 20 30 40 50
To calculate the total distance of the journey,
you must calculate the area under the graph.
9
80 60 40 20 0




Velocity (m/s)
t/s
10 20 30 40 50
Chapter 15
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1. What is the velocity after 10s?
2. What is the acceleration between 20 a 30s?
3. What is the deceleration between 30 and 50s?
4. What was the distance of the journey?

GCSE Additional Science
1) 40m/s 2) 2m/s2 3) 3m/s2 4) 1700m