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A cheetah can run at speeds of up to 120 km/h.
Speed 03
Speed is a measure of how quickly something moves. In science, we use it to compare objects from sprinting athletes to spacecraft crossing huge distances.
1 .
How long would it take to run 800 m at a speed of 8 m/s?
80 seconds
100 seconds
1 hour
100 minutes
Time = distance/speed so 800 m / 8 m/s = 100 s
2 .
A car travels at 70 mph. How long will it take to travel 210 miles?
20 minutes
2.1 hours
3 hours
7 hours
Time = 210 miles/70 mph = 3 hours
3 .
How long would it take to ride a motorbike 300,000 m at a speed of 60 km/h?
0.5 hours
5 hours
5,000 minutes
5,000 hours
300,000 m = 300 km so time = 300 km / 60 km/h = 5 hours. Light does it in 0.1 seconds!
4 .
How long would it take to travel 100 km at a speed of 50 km/h?
2 hours
60 minutes
5,000 seconds
5 hours
Time = distance/speed so 100 km / 50 km/h = 2 hours
5 .
How long would it take to travel 3 km at a speed of 15 m/s?
5 seconds
200 seconds
45 minutes
2 hours
3 km = 3,000 m so time = 3,000 m / 15 m/s = 200 s
6 .
If distance is measured in metres and speed in m/s, time is measured in .......
seconds
minutes
hours
None of these
Seconds are the basic SI unit of time and for calculations involving speed, you often need to convert hours into seconds to get the correct answer
7 .
A cheetah runs at 100 km/h. How long will it take to run 100 metres?
1 second
0.001 hours
1 minute
1 hour
100 m = 0.1 km so time = 0.1/100 = 0.001 hours, 1 hour = 3,600 seconds so 0.001h = 3.6 seconds! The fastest humans take over 9 seconds to cover the same distance
8 .
If distance is measured in miles and speed in mph, time is measured in .......
seconds
minutes
hours
None of these
When answering questions about speed, you need to pay close attention to the units and sometimes you will need to convert the units into something more suitable for carrying out the calculation
9 .
How long would it take to run 400 m at a speed of 5 m/s?
20 seconds
80 seconds
80 minutes
8 hours
Time = distance/speed so 400 m / 5 m/s = 80 s
10 .
If distance is measured in kilometres and speed in km/h, time is measured in .......
seconds
minutes
hours
None of these
In many situations, it is easier to understand speeds in terms of km/h rather than m/s
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