Physics Chapter on Speed

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Questions and Answers

How is speed defined in physics?

  • The time taken to cover a certain distance.
  • The force applied on an object during motion.
  • The distance covered in a specific direction.
  • The ratio of distance to time. (correct)

What is the speed of a person who runs 100 meters in 20 seconds?

  • 15 meters per second
  • 2 meters per second
  • 5 meters per second (correct)
  • 10 meters per second

What is the unit of measurement commonly used for speed?

  • Liters per minute
  • Meters squared
  • Meters per second (correct)
  • Kilograms per hour

If a car travels 300 km in 2 hours, what is its average speed?

<p>150 km/h (C)</p> Signup and view all the answers

Which formula is used to calculate average speed?

<p>speed = \frac{distance}{time} (C)</p> Signup and view all the answers

What is the formula for calculating speed?

<p>Speed = Distance / Time (C)</p> Signup and view all the answers

If a car travels 150 km in 2 hours, what is its speed?

<p>50 km/h (C)</p> Signup and view all the answers

How fast does an airplane travel according to the provided table?

<p>33 m/s (C)</p> Signup and view all the answers

Which unit is appropriate for measuring speed in kilometers per hour (km/h)?

<p>Distance in kilometers and time in hours (C)</p> Signup and view all the answers

What is the speed of a runner who covers 100 meters in 19 seconds?

<p>5.26 m/s (C)</p> Signup and view all the answers

What does accuracy in time measurement refer to?

<p>How close a measured value is to the actual value. (A)</p> Signup and view all the answers

What is the significance of using three significant figures in time measurements?

<p>It maintains enough precision to distinguish very close results. (A)</p> Signup and view all the answers

Which factor influences the accuracy of time measurements during a sprint?

<p>Reaction time of the participant. (D)</p> Signup and view all the answers

How do automated methods improve time measurement accuracy in a laboratory?

<p>They activate timers based on object detection. (A)</p> Signup and view all the answers

In what context is it particularly important to consider the accuracy of time measurement?

<p>High-stakes sprinting competitions. (C)</p> Signup and view all the answers

What does a horizontal line on a distance-time graph indicate?

<p>The object is stationary. (A)</p> Signup and view all the answers

What can be inferred if the slope of the line on a distance-time graph is steep?

<p>The object has a high speed. (C)</p> Signup and view all the answers

How does a straight line on a distance-time graph relate to speed?

<p>Indicates that speed is constant. (B)</p> Signup and view all the answers

What happens to the slope of the distance-time graph if the speed of the object decreases?

<p>The slope becomes shallower. (B)</p> Signup and view all the answers

In what scenario would the distance-time graph show a complete stop in movement?

<p>As the line is horizontal. (D)</p> Signup and view all the answers

What does a horizontal line on a distance-time graph represent?

<p>Rest (D)</p> Signup and view all the answers

Which of the following indicates a changing speed on a distance-time graph?

<p>A curved line (B)</p> Signup and view all the answers

When an object's speed is constant, how is this depicted on a distance-time graph?

<p>By a straight line (D)</p> Signup and view all the answers

If the slope of a distance-time graph becomes steeper, what does this indicate about the object's motion?

<p>The object is accelerating (D)</p> Signup and view all the answers

Which scenario would produce a straight line on a distance-time graph?

<p>An object moving at a steady pace (A)</p> Signup and view all the answers

How can the average speed be calculated from a distance-time graph?

<p>By dividing distance by time (D)</p> Signup and view all the answers

What type of line on a distance-time graph suggests that the object is at rest?

<p>A flat horizontal line (C)</p> Signup and view all the answers

If a distance-time graph shows a line that is less steep over time, what can be inferred?

<p>The object is decelerating (C)</p> Signup and view all the answers

What is the primary advantage of using photoelectric gates for time measurement?

<p>They provide more accuracy for short time intervals. (C)</p> Signup and view all the answers

Which of the following terms best describes the consistency of repeated measurements?

<p>Precision (C)</p> Signup and view all the answers

How does reaction time affect the measurement of time intervals?

<p>It can skew the results, especially in short intervals. (B)</p> Signup and view all the answers

In the formula $v=\frac{l}{t}$, what does the variable $l$ represent?

<p>Length or distance traveled (C)</p> Signup and view all the answers

What type of instrument is a chronometer?

<p>A traditional instrument for timing events (C)</p> Signup and view all the answers

Flashcards

Definition of Speed

Speed is how quickly something moves. It's calculated by dividing distance by time.

Average Speed Formula

Average speed is calculated by dividing total distance by total time.

Speed Units

Speed is measured in units like meters per second (m/s) or kilometers per hour (km/h).

Calculating Speed - Example

To find speed, divide the distance traveled by the time taken to travel that distance.

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Speed Calculation Units

Speed can be calculated using meters and seconds or kilometers and hours.

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Speed

How fast something moves, measured as the distance traveled over a specific time.

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Speed Formula

Speed = Distance / Time

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Units of Speed

Speed is measured in units like meters per second (m/s) or kilometers per hour (km/h).

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Calculating Speed

To find the speed, divide the total distance traveled by the total time taken.

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Average Speed

The total distance traveled divided by the total time taken.

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Accuracy vs. Precision

Accuracy is how close a measurement is to the true value, while precision is how consistent repeated measurements are.

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What is a Stopwatch?

A stopwatch is a device used to measure time intervals, often in seconds or fractions of seconds.

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Why is Reaction Time Important?

Reaction time is the time taken to respond to a stimulus. It affects the accuracy of time measurements because it introduces a delay.

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Automated Time Measurement

Automated systems like light sensors can measure time more accurately, especially for fast events.

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Different Time Measurement Contexts

The best method for measuring time depends on the context. For instance, human reaction time needs different methods compared to a track race.

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Distance-Time Graph

A visual representation of an object's motion, showing how distance changes over time.

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Constant Speed

Moving at the same rate without changing speed.

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Changing Speed

Motion where the speed is increasing or decreasing.

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Acceleration

Speeding up.

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Deceleration

Slowing down.

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Rest

When an object is not moving.

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How to find Average Speed

Calculate the total distance traveled and the total time taken, then divide distance by time.

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Photoelectric Gate

A device that uses light beams to measure the time an object takes to pass through, providing more accurate results for short intervals compared to a stopwatch.

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Reaction Time

The time delay between a stimulus and a person's response. This delay influences the accuracy of time measurements, especially for short durations.

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Accuracy

How closely a measurement aligns with the true value. A more accurate measurement is closer to the real value.

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Precision

The number of significant figures in a measurement, indicating the level of detail. A more precise measurement has more digits.

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Why are photoelectric gates more accurate for short time intervals?

Photoelectric gates are more accurate for short time intervals because they eliminate the human reaction time error that affects stopwatch measurements.

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Speed from Distance-Time Graph

The speed of an object can be found by calculating the slope (steepness) of the line on a distance-time graph. A steeper line indicates faster speed.

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Horizontal Line on a Distance-Time Graph

A flat, horizontal line in a distance-time graph indicates zero speed, which means the object is stationary.

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