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Calculating Speed
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A plane travels at 500 km/h for 4 hours. How far does it travel?
2000 km
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the total distance divided by total time. (instantaneous, average)
Average speed
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What is the speed of a runner who runs 100 meters in 20 seconds?
5 m/s
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What is the speed of a car if it travels 120 kilometers in 2 hours?
60 km/h
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_____________ is a measure of how far something travels in a particular time. (acceleration, speed)
Speed
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the rate at which an object's speed changes. (velocity, acceleration)
Acceleration
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How do you calculate speed?
Speed = distance travelled / time taken
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What is the speed of a car that travels 150 km in 3 hours?
50 km/h
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The speed at any given moment in time.
instantaneous speed
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If a train is moving at 60 m.p.h. and another train is moving at 60 m.p.h. in the opposite direction, what is their relative speed?
120 m.p.h
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If the distance-time graph is steep, what does that tell you about speed? (fast, slow)
The object is moving fast.
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What speed can a sneeze reach in m.p.h.?
100 m.p.h
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What happens if a distance-time graph line is horizontal?
The object is stationary or at rest.
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What happens if the line on a distance-time graph is curved?
accelerating
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What is the average speed of a marathon runner who runs 42.2 km in 2.5 hours?
16.88 km/h
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What is the speed of a car that travels 90 kilometers in 1.5 hours?
60 km/h
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If you walk at a speed of 5 km/h, how long will it take you to walk 15 kilometers?
3 hours
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The steeper the slope, the (faster, slower, stationary) the object is moving.
faster
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If you travel 100 meters in 50 seconds, what is your speed?
2 m/s
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It describes how fast one object is moving compared to another
Relative motion
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the speed at a specific moment. (average or instantaneous)
instantaneous speed
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What is the unit used for speed in Physics?
Metres per second (m/s)
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A marathon runner runs at an average speed of 10 km/h for 4 hours. How far does the runner travel?
40 kilometers
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If a car is moving at 30 m.p.h. towards another car, what is their relative speed?
60 m.p.h
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How do you calculate average speed?
Average speed = total distance / total time.
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If a car’s speed is 80 km/h, how far will it travel in 3 hours?
240 km
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How long does it take for a train to travel 300 kilometers at a speed of 75 km/h?
4 hours
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What is the speed of sound in air in m.p.h.?
738 m.p.h
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What is the relative speed if two cars are moving at the same speed at the same direction?
zero
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What is the cruising speed of an airplane in m/s?
255 m/s
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How long does it take for a cyclist to cover 20 kilometers at a speed of 10 km/h?
2 hours
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It shows how far an object travels over time.
distance–time graph
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If a sprinter runs 100 meters in 10 seconds, what is their speed?
10 m/s
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What is the speed of light in air in m.p.h.?
670,000,000 m.p.h
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What is the speed of a car that travels 600 meters in 60 seconds?
10 m/s
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If a runner runs 200 meters in 25 seconds, what is their speed?
8 m/s
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How would you describe the relative speed of two cars moving towards each other at 60 km/h?
120 km/h
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If a cyclist travels 240 meters in 60 seconds, what is their speed?
4 m/s
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What is the speed of light in air in m/s?
300,000,000 m/s
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What is the speed of a car moving 100 kilometers in 2 hours?
50 km/h
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If a train is traveling at 100 km/h, how long will it take to cover 400 kilometers?
4 hours
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If a motorbike travels at 80 km/h for 2.5 hours, how far will it travel?
200 kilometers
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If a graph shows a straight line moving upward, what does this indicate? (constant, changing speed)
constant
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