Speed Flashcards
What is the standard unit for speed?
The standard unit for speed is metres per second (m/s).
What does “metres per second” mean in terms of speed?
“Metres per second” means the number of metres travelled in each second.
How is speed written in unit form?
Speed is written as m/s.
How do you calculate speed?
A bus travels 100 m in 20 s. What is its speed?
What is average speed?
Average speed is the total distance travelled divided by the total time taken, used when the speed of an object changes during a journey.
What does “constant speed” mean?
Constant speed means that the speed is not changing over time.
How can the speed formula be used in different calculations?
The speed formula can also be used to calculate:
• The distance travelled, if you know the speed and time taken. • The time taken, if you know the speed and the distance travelled.
What are the formulas for speed, distance, and time using the formula triangle?
• Speed = Distance / Time
• Distance = Speed × Time
• Time = Distance / Speed
Marcus rides his bicycle at a speed of 4 m/s for 60 seconds. How far does he go?
Sofia is in a car traveling at a speed of 35 m/s. How long will it take the car to travel 2100 m?
An aeroplane travels 2500 km in a time of 5 hours. What is the speed of the aeroplane in km/h?
What units are used in the worked examples provided?
The worked examples use metres (m), seconds (s), and metres per second (m/s), but values can also be given in different units such as kilometres (km) and hours (h).
How do you convert speed to different units like km/h?
To convert speed to km/h, divide the distance in kilometres by the time in hours.
Write an equation for speed, when you know the distance travelled and the time taken.
What is the standard scientific unit of speed?
The standard unit of speed is metres per second (m/s).
Write an equation for distance travelled, when you know the speed and the time taken.
Write an equation for time taken, when you know the speed and the distance.
An Olympic sprinter completes the 100 m race in a time of 10 s. Calculate the average speed of the sprinter.
Explain why this value is an average speed.
This value is an average speed because it assumes a constant speed over the entire distance, without considering any acceleration or deceleration.
A car travels a distance of 210 m in a time of 6 s. Calculate the speed of the car in m/s.
Calculate the distance travelled by the car in 14 s, if the speed is constant.
Calculate the time taken, in seconds, for the car to travel a distance of 1925 m.
An aeroplane flies between two cities that are 8100 km apart. It takes 9 hours to complete the journey. Calculate the average speed in km/h.
A different aeroplane can fly at 800 km/h. Calculate the distance this aeroplane could fly in 6 hours.
Another aeroplane can fly at 950 km/h. Calculate the time taken, in hours, for this aeroplane to travel a distance of 7125 km.
Anna sees a worm move a distance of 3 m in 2 hours. Calculate the average speed of the worm in metres per hour.
