Time Distance Speed - PowerPoint PPT Presentation

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Time Distance Speed

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12/1/09. Created by Mr. Lafferty Maths Dept. S3 General ... midday. 1100. 1000. 0900. 0800. 0700. 0600. 0500. 0400. 0300. 0200. 0100. 0000. 11 am. 10 am. 9 am ... – PowerPoint PPT presentation

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Title: Time Distance Speed


1
Time Distance Speed
Revision of Level Time
Time Difference (Counting Method)
Calculating Distance
Calculating Speed
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Calculating Time
Mixed Problems
Time Distance Graphs
2
Starter Questions
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3
Time
Revision of Time
Learning Intention
Success Criteria
  1. To revise previous Time work.

1. Convert 12hr to 24hr clock.
2. Convert 24hr to 12hr clock.
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3. Count Method to find time intervals.
4
Converting Time
Revision on Time
Learning Intention
Success Criteria
  • To revise Level D work on converting between
  • 12 and 24 hr clock and vice versa.
  1. Change from 12 to 24 hour clock.

2. Change from 24 to 12 hour clock.
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5
To go from 12 hour clock to 24 hour clock just
add 12 to the pm hours
2100
2000
1830
2330
1620
1510
6
To go from 24 hour clock to 12 hour clock just
subtract 12 from the hours if it is greater than
12
9 pm
8 pm
530 pm
1008 pm
806 pm
150 pm
7
Converting Time
S3 General
Lets make up our own questions !
Key Points
pm times add on 12
12 hour clock
24 hour clock
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Analogue clock
Digital clock
ALWAYS use AM or PM
ALWAYS 4 digits
NEVER use AM or PM
Hours 1 - 12
greater than 12 subtract 12
Hours 0 - 24
8
Time
Revision of Time
Now try Exercise 1 Ch10 (page 108)
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9
Starter Questions
A
T
W
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10
Counting Method
Learning Intention
Success Criteria
  1. To explain the counting method to find the
    difference between two times.

1. Understand the counting method.
2. Find time differences between two times,
showing all working.
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11
Counting Method
Level D
When working out time difference we will use the
Counting Method. This method will always work.
Example Find the time difference between 08
40 hrs and 11 10 hrs
Hrs Mins
nearest hour
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Whats left
20
hours
2
08 40
11 00
11 10
09 00

10
20 mins
2 hrs
10 mins
2 30
12
But there are 60 minutes 1hour 70 mins 1hr
10mins
Counting Method
Level D
A bus leaves Kirkintilloch Main Street at 14 40
hrs and arrives in Aberdeen at 18 50 hrs. How
long was the journey.
nearest hour
Whats left
Hrs Mins
hours
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20
14 40
18 00
18 50
15 00
3
20 mins
3 hrs
50 mins

50
3 70
4hrs 10 mins
13
How long does the first bus take from Kirkie to
Glasgow.
nearest hour
Hrs Mins
Whats left
hours
35
35
08 25
09 00
09 14
09 00
0
0
35 mins
0 hrs
14 mins
14

14
49
14
But there are 60 minutes 1hour
Counting Method
Level D
Lets make up our own question ! The key steps
are left on the slide to help you.
nearest hour
Whats left
Hrs Mins
hours
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mins
hrs
mins

15
Time
Revision of Level D/E
Now try Exercise 2 Ch10 (page 109)
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16
Starter Questions
6x
4x
4x
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17
Distance
Working Out Distance
Learning Intention
Success Criteria
  1. Know the distance formula.

1. To explain how to work out simple distance
calculations using the distance formula.
2. Use the formula to work out simply distance
calculations.
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18
Distance
Working out Distances
Imagine you were travelling in a train at a
steady speed of 80km/hr.
In 1 hour you travel
80 x 1 80 km
In 2 hours you travel
80 x 2 160 km
In 3 hours you travel
80 x 3 240 km
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Can you guess what the formula is
in symbols
19
Distance
Working Out Distance
Now try Exercise 3 Ch10 (page 110)
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20
Starter Questions
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21
Speed
Working Out Speed
Learning Intention
Success Criteria
  1. Know the speed formula.

1. To explain how to work out simple speed
calculations using the speed formula.
2. Use the formula to work out simple speed
calculations.
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22
Speed
Working Out Speed
Imagine you sailed 45 kilometres between two
islands and it took 3 hours.
In 3 hours you travel
45 km
In 1 hour you travel
45 3 15 km
This means your speed is
15km/hr
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Can you guess what the formula is
in symbols
23
Speed
Working Out Speed
Now try Exercise 4 Ch10 (page 112)
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24
Starter Questions
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4 cm
x cm
25
Time
Working Out Time
Learning Intention
Success Criteria
  1. Know the time formula.

1. To explain how to work out simple time
calculations using the time formula.
2. Use the formula to work out simple time
calculations.
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26
Time
Working Out Time
Imagine you flew 800 miles to Paris and the
average speed of the plane was 200 miles/hr.
To travel 200 miles takes 1 hour
To travel 800 miles takes
800 200 4 hours
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Can you guess what the formula is
in symbols
27
Time
Working Out Time
Now try Exercise 5 Ch10 (page 113)
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28
Starter Questions
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29
Time Distance Speed
Mixed Problems
Learning Intention
Success Criteria
1. Know and remember triangle method for
distance, speed time problems.
1. To show the traingle method of remembering
the distance, speed and time formulae.
2. Apply triangle method to mixed problems.
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30
Time Distance Speed
Mixed Problems
DS x T
D
S
T
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Simple way to remember the 3 formulae !
31
Time Distance Speed
Mixed Problems
Example 1 Daniel drove from his house to the
Blackpool, a distance of 135 miles. It took him
2hrs 15mins. What was his average speed?
Time MUST be in decimal form
Working
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32
Time Distance Speed
Mixed Problems
Example 2 A racing car travelled at 50 km/hr.
What is the distance covered in 6 hours ?
Working
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33
Time Distance Speed
Mixed Problems
Example 1 How long did the bus journey take if
it travelled a total distance of 60 km at and an
average speed of 40 km/hr.
Working
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34
Time Distance Speed
Mixed Problems
Now try Exercise 6 Ch10 (page 114)
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35
Starter Questions
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36
Time Distance Graph
Interpreting Time Distance Graphs
Learning Intention
Success Criteria
1. Understand the term interpret.
  • To interpret
  • Time Distance Graphs.
  • Understand that the speed can be calculated from
    the
  • Time - Distance Graph.

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37
Time Distance Graph
Interpreting Time Distance Graphs
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38
Time Distance Speed
Now try Exercise 7 Ch10 (page 115)
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