Speed

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수업 노트

What is Speed?

Speed is a measure of the distance an object moves in a certain time.
Common units include miles per hour (mph) and kilometres per hour (km/h).
In physics, speed is usually measured in metres per second (m/s).
Constant speed means the same distance is covered each second (e.g., 30 m/s = 30 m every second).

A person walking at 2.0 m/s and a bee flying at 4.5 m/s, illustrating average speed.

Calculating Speed

The equation for speed is: Speed = Distance ÷ Time.
Example: A car travels 400 m in 20 s → Speed = 400 ÷ 20 = 20 m/s.
Always include the correct units (m/s) in your answer.

Calculating Distance

Rearrange the speed equation: Distance = Speed × Time.
Example: An athlete runs at 8 m/s for 50 s → Distance = 8 × 50 = 400 m.

Calculating Time

Rearrange the speed equation: Time = Distance ÷ Speed.
Use this when you know distance and speed and need to find time.

Relative Speed

The speed of one object relative to another can be found by adding speeds.
Example: Car at 30 m/s, train 20 m/s faster → train speed = 30 + 20 = 50 m/s.

Two cars with the same speed but different velocities, illustrating that velocity includes direction.

Units and Conversions

Speed units: m/s (metres per second), km/h (kilometres per hour), mph (miles per hour).
In calculations, ensure distance and time are in compatible units (e.g., metres and seconds).

Worked Examples

Cyclist: 120 m in 20 s → Speed = 120 ÷ 20 = 6 m/s.
Runner: 1500 m in 500 s → Speed = 1500 ÷ 500 = 3 m/s.
Dog walker: 1200 m in 1000 s → Speed = 1200 ÷ 1000 = 1.2 m/s.

Key Points

Speed = Distance ÷ Time is the core formula.
You can rearrange it to find distance or time.
Constant speed means the object covers equal distances in equal time intervals.

슬라이드

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연습 문제

무료 미리 보기 — 71개 중 8개 문제. 가입하면 전부 볼 수 있어요.

1.What is speed a measure of?
Easy
- AThe distance an object has moved in a certain time
- BThe time an object takes to move a certain distance
- CThe force acting on an object
- DThe mass of an object
2.Which of the following is the correct equation for speed?
Easy
- ASpeed = Distance × Time
- BSpeed = Distance ÷ Time
- CSpeed = Time ÷ Distance
- DSpeed = Distance + Time
3.An object is travelling at a constant speed of 20 m/s. How far does it travel every second?
Easy
- A20 m
- B10 m
- C40 m
- D5 m
4.A car is travelling at 20 m/s and a train is travelling 10 m/s faster than the car. What is the speed of the train?
Easy
- A10 m/s
- B20 m/s
- C30 m/s
- D200 m/s
5.A cyclist travels a distance of 120 m in 20 seconds. What is the cyclist's speed?
Medium
- A6 m/s
- B2400 m/s
- C0.17 m/s
- D100 m/s
6.A runner travels 1500 m in 500 s. What is the runner's speed?
Medium
- A3 m/s
- B750000 m/s
- C0.33 m/s
- D1000 m/s
7.A sound wave travels 686 m in 2 seconds. What is the speed of sound?
Medium
- A343 m/s
- B1372 m/s
- C344 m/s
- D684 m/s
8.Light travels 4,500,000,000 m in 15 seconds. What is the speed of light?
Medium
- A300,000,000 m/s
- B300,000 m/s
- C67,500,000,000 m/s
- D4,500,000,015 m/s

더 많은 문제

9.A car travels at 25 m/s for 400 s. How far does it travel?
Medium
- A10,000 m
- B16 m
- C425 m
- D375 m
10.A motorbike travels at a constant speed of 40 m/s for 20 s. What distance does it cover?
Medium
- A800 m
- B2 m
- C60 m
- D20 m
11.A car travels 100 m at a speed of 20 m/s. How long does the journey take?
Medium
- A5 s
- B2000 s
- C0.2 s
- D120 s
12.A train travels at 50 m/s and a car travels at 30 m/s. How much faster is the train?
Easy
- A20 m/s
- B80 m/s
- C1.67 m/s
- D1500 m/s
13.A runner completes a 400 m race in 50 seconds. What is the runner's average speed?
Medium
- A8 m/s
- B0.125 m/s
- C20,000 m/s
- D8 km/h
14.A cheetah runs at a constant speed of 30 m/s. How far does it travel in 8 seconds?
Medium
- A240 m
- B3.75 m
- C240 km
- D2400 m
15.A snail moves at 0.01 m/s. How long does it take to crawl 0.5 m?
Medium
- A50 s
- B0.005 s
- C500 s
- D0.02 s
16.A car travels 150 km in 2 hours. What is its average speed in m/s?
Medium
- A20.8 m/s
- B75 m/s
- C300 m/s
- D0.0133 m/s
17.Which of the following is a typical unit for speed?
Easy
- Am/s
- Bm
- Cs
- Dkg
18.A train travels at 60 m/s. A car travels at 20 m/s. How much faster is the train than the car?
Easy
- A40 m/s
- B3 m/s
- C80 m/s
- D1200 m/s
19.A graph shows distance on the y-axis and time on the x-axis. The line is straight and passes through the origin. What does the gradient represent?
Medium
- Aspeed
- Bdistance
- Ctime
- Dacceleration
20.A student measures the time for a ball to roll 1 m, 2 m, and 3 m. Which quantity is the independent variable?
Medium
- Adistance
- Btime
- Cspeed
- Dball mass
21.A car travels at 20 m/s for 10 s, then at 30 m/s for 20 s. What is the total distance travelled?
Medium
- A800 m
- B500 m
- C1000 m
- D600 m
22.A person walks 100 m in 100 s. What is their speed?
Easy
- A1 m/s
- B0.01 m/s
- C100 m/s
- D10,000 m/s
23.A sound wave travels 686 m in 2 s. What is the speed of sound?
Medium
- A343 m/s
- B1372 m/s
- C0.0029 m/s
- D343 km/h
24.In an experiment to measure the speed of a trolley, a student uses a ticker timer that makes 50 dots per second. The distance between 10 dots is 0.4 m. What is the speed?
Hard
- A2 m/s
- B0.8 m/s
- C20 m/s
- D0.08 m/s
25.A student uses a ticker timer that makes 50 dots per second to measure the speed of a trolley. The distance between the first and eleventh dot is 0.4 m. What is the speed of the trolley?
Hard
- A2 m/s
- B0.4 m/s
- C20 m/s
- D0.2 m/s
26.In an experiment to measure the speed of a toy car, a student marks the car's position every 0.5 seconds. The marks are 0.3 m, 0.9 m, 1.5 m, and 2.1 m from the start. Which statement about the car's motion is correct?
Medium
- AThe car is accelerating because the distance between marks increases.
- BThe car is moving at constant speed because the distance between marks is constant.
- CThe car is decelerating because the marks get closer together.
- DThe car is stationary because the marks are equally spaced.
27.A student measures the time for a ball to roll down a ramp from different heights. Which quantity is the independent variable?
Easy
- ATime taken
- BDistance travelled
- CHeight of ramp
- DSpeed of ball
28.A student uses a light gate and timer to measure the speed of a trolley. The trolley passes through two light gates 0.5 m apart. The timer records 0.25 s between the gates. What is the speed of the trolley?
Easy
- A0.5 m/s
- B2 m/s
- C0.125 m/s
- D0.25 m/s
29.A student investigates how the speed of a trolley changes as it rolls down a ramp. She measures the time to travel 1 m from rest. She repeats the experiment with different ramp heights. Which graph would best show the relationship between ramp height and speed?
Medium
- ABar chart of speed for each height
- BLine graph of speed against height
- CPie chart of speed distribution
- DScatter graph with no line
30.A student uses a stopwatch to measure the time for a toy car to travel 2 m. He repeats the measurement three times and gets times of 4.2 s, 4.0 s, and 4.1 s. What is the average speed of the car?
Medium
- A0.49 m/s
- B0.5 m/s
- C0.48 m/s
- D0.47 m/s
31.A student measures the speed of a trolley using a ticker timer that makes 50 dots per second. The tape shows 10 dots in a distance of 0.2 m. What is the speed of the trolley?
Medium
- A1 m/s
- B0.5 m/s
- C2 m/s
- D0.25 m/s
32.Which piece of equipment is used to measure time accurately in a speed experiment?
Easy
- AStopwatch
- BRuler
- CBalance
- DThermometer
33.A car travels at a constant speed of 30 m/s. How far does it travel in 5 seconds?
Easy
- A150 m
- B6 m
- C35 m
- D150 m/s
34.A runner runs 200 m in 25 seconds. What is the runner's average speed?
Easy
- A8 m/s
- B0.125 m/s
- C5 m/s
- D8 m
35.A train travels at 50 m/s for 2 minutes. How far does it travel?
Medium
- A100 m
- B6000 m
- C6000 m/s
- D100 km
36.A car travels 100 km in 2 hours. What is its average speed in m/s?
Medium
- A50 m/s
- B13.9 m/s
- C27.8 m/s
- D200 m/s
37.A student uses a ticker timer that makes 50 dots per second. The distance between 10 dots is 0.4 m. What is the speed of the trolley?
Medium
- A2 m/s
- B0.8 m/s
- C20 m/s
- D4 m/s
38.A student investigates how the speed of a trolley changes as it rolls down a ramp. She measures the time to travel 1 m from rest. She repeats the experiment with different ramp heights. What is the independent variable?
Easy
- ATime taken
- BDistance travelled
- CRamp height
- DSpeed of trolley
39.A student uses a stopwatch to measure the time for a toy car to travel 2 m. He repeats the measurement three times and gets times of 4.2 s, 4.0 s, and 4.1 s. What is the average time?
Easy
- A4.1 s
- B4.2 s
- C4.0 s
- D4.3 s
40.A car travels at 20 m/s for 10 s, then at 30 m/s for 20 s. What is the average speed for the whole journey?
Hard
- A25 m/s
- B26.7 m/s
- C30 m/s
- D20 m/s
41.If an object travels at a constant speed of 12 m/s, it travels a distance of 12 metres every second.
Easy
True or false?
42.A car is travelling at 30 m/s and a train is travelling 20 m/s faster than the car. What is the speed of the train?
Easy
- A10 m/s
- B30 m/s
- C50 m/s
- D20 m/s
43.Which of the following are correct units for speed? (select all that apply)
Medium
- Am/s
- Bkm/h
- Cmph
- Dm per s
- Em
44.Match each quantity to its correct unit.
Easy
- Speed
- Distance
- Time
- m/s
- m
- s
45.Arrange the following speeds from slowest to fastest.
Easy
- 10 m/s
- 5 m/s
- 20 m/s
- 15 m/s
46.A car travels at a constant speed of 20 m/s for 10 s, then at 30 m/s for 20 s. What is the total distance travelled?
Medium
- A800 m
- B600 m
- C500 m
- D1000 m
47.Arrange the following speeds from slowest to fastest: 10 m/s, 5 m/s, 20 m/s, 15 m/s.
Easy
- 10 m/s
- 5 m/s
- 20 m/s
- 15 m/s
48.In an experiment to measure the speed of a toy car, a student uses a light gate and timer. The car passes through two light gates that are 0.5 m apart. The timer records a time of 0.25 s between the two gates. What is the speed of the car?
Easy
- A2.0 m/s
- B0.125 m/s
- C1.0 m/s
- D0.5 m/s
49.A student uses a ticker timer that makes 50 dots per second to measure the speed of a trolley. The tape shows 10 dots in a distance of 0.4 m. What is the speed of the trolley?
Medium
- A2.0 m/s
- B0.4 m/s
- C5.0 m/s
- D0.2 m/s
50.In an experiment to measure speed, the independent variable is the distance travelled and the dependent variable is the time taken.
Easy
True or false?
51.Complete the sentence using the correct word from the source.
Easy
Speed is a measure of the ____ an object has moved in a certain time.
52.Complete the sentence with the correct units.
Easy
In physics, speed is usually measured in ____ per ____.
53.Write the equation to calculate speed using symbols.
Easy
Speed = ____ ÷ ____
54.A car travels a distance of 400 m in a time of 20 seconds. Calculate the speed of the car.
Easy
55.Someone walking their dog travels a distance of 1200 m in a time of 1000 seconds. Calculate the speed of the dog walker.
Easy
56.A car travels at a speed of 25 m/s for a time of 400 s. Calculate the distance travelled by the car.
Easy
57.An athlete runs a race at an average speed of 8 m/s. The athlete takes a time of 50 seconds to complete the race. Calculate the distance of the race.
Easy
58.An object is travelling at a constant speed of 8 m/s. How far does it travel each second?
Easy
59.A runner travels a distance of 1500 m in a time of 500 s. Calculate the speed of the runner.
Easy
60.Use the correct word from the source to complete the sentence.
Easy
The equation to calculate speed is: Speed = Distance ____ Time.
61.In a speed experiment, which piece of equipment is used to measure time accurately?
Easy
62.A student investigates how the speed of a trolley changes as it rolls down a ramp. She measures the time to travel 1 m from rest. She repeats the experiment with the ramp at different heights. For a ramp height of 10 cm, the trolley takes 0.8 s to travel 1 m. Calculate the average speed of the trolley in m/s.
Medium
63.Describe what speed is.
Easy
64.Describe one method to measure the speed of a toy car moving along a straight track. Include the equipment you would use and how you would calculate the speed.
Medium
65.A car travels a distance of 400 m in a time of 20 seconds. Calculate the speed of the car.
Easy
- A18 m/s
- B24 m/s
- C20 m/s
- D22 m/s
66.Someone walking their dog travels a distance of 1200 m in a time of 1000 seconds. Calculate the speed of the dog walker.
Easy
- A0.2 m/s
- B3.2 m/s
- C1.2 m/s
- D2.2 m/s
67.A car travels at a speed of 25 m/s for a time of 400 s. Calculate the distance travelled by the car.
Easy
- A10000 m
- B12000 m
- C9000 m
- D11000 m
68.An athlete runs a race at an average speed of 8 m/s. The athlete takes a time of 50 seconds to complete the race. Calculate the distance of the race.
Easy
- A360 m
- B480 m
- C440 m
- D400 m
69.An object is travelling at a constant speed of 8 m/s. How far does it travel each second?
Easy
- A8 m
- B7 m
- C10 m
- D9 m
70.A runner travels a distance of 1500 m in a time of 500 s. Calculate the speed of the runner.
Easy
- A3 m/s
- B2 m/s
- C4 m/s
- D5 m/s
71.A student investigates how the speed of a trolley changes as it rolls down a ramp. She measures the time to travel 1 m from rest. She repeats the experiment with the ramp at different heights. For a ramp height of 10 cm, the trolley takes 0.8 s to travel 1 m. Calculate the average speed of the trolley in m/s.
Medium
- A0.25 m/s
- B2.25 m/s
- C1.25 m/s
- D3.25 m/s

복습 노트

## Speed - **Speed** measures how fast an object moves: distance covered in a given time. - Common units: miles per hour (mph), kilometres per hour (km/h). In physics: **metres per second (m/s)**. - Constant speed means equal distance each second (e.g., 30 m/s → 30 m every second). ### Key Formula $$\text{Speed} = \frac{\text{Distance}}{\text{Time}}$$ - To find distance: $$\text{Distance} = \text{Speed} \times \text{Time}$$ - To find time: $$\text{Time} = \frac{\text{Distance}}{\text{Speed}}$$ ### Example Calculations 1. **Finding speed**: Car travels 400 m in 20 s. $$\text{Speed} = 400 \div 20 = 20 \text{ m/s}$$ 2. **Finding distance**: Athlete runs at 8 m/s for 50 s. $$\text{Distance} = 8 \times 50 = 400 \text{ m}$$ ### Relative Speed - If one object is faster than another, add the speeds. - Car at 30 m/s, train 20 m/s faster → train speed = 30 + 20 = 50 m/s.

Speed: A measure of the distance an object has moved in a certain time.
Metres per second (m/s): The standard unit of speed in physics.
Constant speed: When an object travels the same distance every second.
Speed = Distance ÷ Time: The equation to calculate speed.
Distance = Speed × Time: The equation to calculate distance when speed and time are known.
Relative speed: The speed of one object compared to another; found by adding speeds if moving in the same direction.

플래시카드

What is speed?

Speed is a measure of the distance an object has moved in a certain time.

What units are commonly used for speed in physics?

In physics, speed is usually measured in metres per second (m/s).

What does a constant speed of 30 m/s mean?

It means the object travels a distance of 30 metres every second.

State the equation to calculate speed.

Speed = Distance ÷ Time

How do you calculate distance if you know speed and time?

Distance = Speed × Time

A car travels 400 m in 20 s. Calculate its speed.

Speed = 400 m ÷ 20 s = 20 m/s

An athlete runs at 8 m/s for 50 s. Calculate the distance.

Distance = 8 m/s × 50 s = 400 m

A car is travelling at 30 m/s and a train is 20 m/s faster. What is the train's speed?

The train's speed is 30 m/s + 20 m/s = 50 m/s.

An object travels at constant speed 20 m/s. How far does it travel each second?

It travels 20 metres each second.

An object travels at constant speed 8 m/s. How far does it travel each second?

It travels 8 metres each second.

A car is travelling at 20 m/s, and a train is 10 m/s faster. State the speed of the train.

The train's speed is 30 m/s.

A cyclist travels 120 m in 20 s. Calculate the speed.

Speed = 120 m ÷ 20 s = 6 m/s

A runner travels 1500 m in 500 s. Calculate the speed.

Speed = 1500 m ÷ 500 s = 3 m/s

A dog walker travels 1200 m in 1000 s. Calculate the speed.

Speed = 1200 m ÷ 1000 s = 1.2 m/s

A sound wave travels 686 m in 2 s. Calculate the speed of sound.

Speed = 686 m ÷ 2 s = 343 m/s

Light travels 4,500,000,000 m in 15 s. Calculate the speed of light.

Speed = 4,500,000,000 m ÷ 15 s = 300,000,000 m/s

A car travels at 25 m/s for 400 s. Calculate the distance.

Distance = 25 m/s × 400 s = 10,000 m

A motorbike travels at 40 m/s for 20 s. Calculate the distance.

Distance = 40 m/s × 20 s = 800 m

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