Chapter 13- Motion and Time-Short Questions and Answers(Solved Worksheet)
Question- If a person walks around a playground and ends up at the same spot where they started, what is their displacement?
Answer- Zero.
Question- How do you calculate the speed of an object?
Answer- Speed is calculated as distance divided by time.
Question- What unit is commonly used to measure distance in the context of motion?
Answer- Metres or kilometres.
Question- Give an example of an object at rest.
Answer– A person standing still on a playground.
Question- What is rectilinear motion? Give an example.
Answer- It’s motion in a straight line, like a car driving on a straight road.
Question- Describe circular motion and provide an example.
Answer- Circular motion is when an object moves in a circle around a fixed point. An example is planets orbiting the sun.
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Question- What is periodic motion? Give an example.
Answer- Periodic motion is a regular back-and-forth movement. An example is a swinging pendulum.
Question- What does an odometer measure?
Answer- The total distance travelled by a vehicle.
Question- What is the difference between an odometer and a speedometer?
Answer- An odometer measures the total distance travelled, while a speedometer shows the instantaneous speed of a vehicle.
Question- How do you calculate average speed?
Answer- Average speed is calculated as total distance covered divided by total time taken.
Question- What is the primary difference between non-uniform and uniform motion?
Answer- In non-uniform motion, the speed of an object changes over time, while in uniform motion, an object moves at a constant speed.
Question- Give an example of non-uniform motion from everyday life.
Answer- A car slowing down as it approaches a traffic light and then speeding up again.
Question- Why are examples of uniform motion less common in everyday life?
Answer- Because they require conditions where external forces like friction or air resistance do not cause acceleration or deceleration.
Question- Before clocks, how did people estimate the time of day using shadows?
Answer- By observing the length and direction of shadows, which change as the sun moves across the sky.
Question- What natural event was used to define a day in the past?
Answer- The time from one sunrise to the next.
Question- On what natural cycle is the concept of a month based?
Answer- The lunar cycle, from one new moon to the next.
Question- What is a simple pendulum composed of?
Answer- A heavy object called a ‘bob’ attached to a stand by a thread.
Question- What kind of motion does a pendulum exhibit when it swings?
Answer- ‘To and fro’ motion or oscillatory motion.
Question- Describe one complete oscillation of a pendulum.
Answer- It’s a full movement from the starting point to one side, then to the opposite side, and back to the starting point.
Question- What determines the time period of a pendulum?
Answer- The time it takes to complete one full oscillation.
Question- What is the basic unit of time, and how is it symbolised?
Answer- The second, symbolised as ‘s’.
Question- How many minutes are there in an hour?
Answer- 60 minutes.
Question- What is the basic unit of speed, and how is it represented?
Answer- Metre per second, represented as m/s.
Question- How should you write ’50 kilometres’ in its abbreviated form?
Answer- ’50 km’, in singular form.
Question- How many seconds are there in a day?
Answer– 86,400 seconds (24 hours x 60 minutes x 60 seconds).
Question- What is a practical way to estimate one second?
Answer- By saying “two thousand and one” aloud.
Question- What is the typical heart rate of a healthy adult per minute?
Answer– About 72 beats per minute.
Question- What is the smallest time interval standard clocks and watches can measure?
Answer- One second.
Question- What is a nanosecond, and how is it used in science and technology?
Answer- A nanosecond is one billionth of a second, used in scientific research for precise time measurements.
Question- What is the primary purpose of using a bar graph?
Answer- For comparing different items or quantities easily and visually.
Question- What do the x-axis and y-axis represent on a distance-time graph?
Answer- The x-axis represents time, and the y-axis represents distance.
Question- How do you determine the speed of an object using a distance-time graph?
Answer- The speed is indicated by the slope of the line. A steeper slope means higher speed.
Question- What does a horizontal line on a distance-time graph indicate about the object’s motion?
Answer- It indicates that the object is stationary (not moving).
Question- What is the difference between a straight line and a curved line on a distance-time graph?
Answer- A straight line indicates uniform motion (constant speed), while a curved line suggests acceleration or deceleration (non-uniform motion).
Question- If a car is moving at a constant speed, how would its motion be represented on a distance-time graph?
Answer- It would be represented by a straight line.
Question- How can a distance-time graph provide more insight into motion than a table of values?
Answer- It shows the motion over the entire period, not just at discrete times.
Question- What is the formula for calculating speed, and how can it be applied in practical experiments?
Answer- Speed = Distance / Time. It can be applied by measuring the distance travelled and the time taken for an object.
Question- How can you measure the average time period for one oscillation of a pendulum?
Answer- By dividing the total time by the number of oscillations.
Question- What kind of real-world observation can help understand the concept of average speed?
Answer- Observing and comparing the speeds of different vehicles or engaging in activities like walking, running, or cycling to measure the time taken to cover a known distance.
Question- How can distance-time graphs be useful in comparing speeds and understanding uniform and non-uniform motionks?
Answer- They allow for visual comparison of speeds and can demonstrate the uniformity or variability of motion.
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