Measuring speed: practical
Lesson 8 / 10
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Waxaan si sax ah u cabbiri karaa xawaaraha celceliska ee gaari (trolley) ku socda jiiq.
Introduction
In this lesson: I can accurately measure the average speed of a trolley moving down a ramp. A ramp will produce a force that allows a dynamics trolley to roll down it. The average speed of the trolley can be found from distance and time measurements.
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Quizzes
1. Two balls roll the same distance; ball A takes 4 s and ball B takes 3 s. Which statements are correct?
- Ball A was moving faster than ball B.
- Correct answer:Ball A was moving slower than ball B.
- Ball A has a greater average speed than ball B.
- Correct answer:Ball A has a lower average speed than ball B.
2. Which of these are units for speed?
- m
- Correct answer:m/s
- Correct answer:km/h
- N/s
- s/m
3. Which pieces of information are needed to find the average speed of a toy car rolling across a desk?
- The mass of the toy car.
- Correct answer:The time it takes the toy car to travel.
- The height of the desk.
- Correct answer:The distance the toy travels.
- The size of the forces on the car.
4. A bus is travelling at 2 m/s and moves for a time of 30 s. Which of these shows how to calculate the distance the bus has travelled?
- distance = 2 m/s + 30 s
- Correct answer:distance = 2 m/s × 30 s
- distance = 2 m/s ÷ 30 s
- distance = 30 s ÷ 2 m/s
- distance = 30 s - 2 m/s
5. A skater in a race travels a distance of 800 m in a time of 125 s. Calculate their speed.
- 0.16 m/s
- 1.6 m/s
- Correct answer:6.4 m/s
- 675 m/s
- 925 m/s
1. Which feature of a dynamics trolly allows it to roll without slowing down much?
- Correct answer:The wheels have low friction.
- It is very light.
- It is very heavy.
- It produces its own driving force.
2. Which of these measures should be taken to accurately measure the time it takes for a dynamics trolley to roll between two points on a ramp?
- The ramp must have a high gradient (be steep).
- Correct answer:Look directly across the finish line.
- Push the trolley at the start.
- Look along the ramp from the start to the finish line.
- Correct answer:Start the trolley rolling with a countdown.
3. A dynamics trolley is rolled a distance of 1.5 m, taking 3.0 s to cover the distance. What is the average speed of the trolley?
- Correct answer:0.5 m/s
- 2.0 m/s
- 3.5 m/s
- 2.5 m/s
- 4.5 m/s
4. A dynamics trolley is released on ramps with different gradients and is found to have a greater average speed on the steepest ramp. Which of these statements help explain the results?
- Correct answer:The ramp is producing a force on the trolley which speeds it up as it rolls.
- The forces on the trolley are always balanced.
- The greater the gradient, the smaller the resultant force acting on the trolley.
- Correct answer:The greater the gradient, the larger the resultant force acting on the trolley.
- The frictional force keeps the trolley moving.
5. A student times a trolley rolling 1.00 m down a ramp three times. The times were 3.24 s, 3.44 s and 3.36 s. Calculate the average speed of the trolley.
- 0.13 m/s
- Correct answer:0.30 m/s
- 1.0 m/s
- 3.33 m/s
- 30.0 m/s
What pupils see
The same lesson as a pupil sees it. You can set any section as work on its own.
- IntroductionPrepare
- Starter quizActivate · 5 questions
- Lesson videoLearn
- Exit quizCheck · 5 questions