Motion in Physics: Straight Line Motion
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Questions and Answers

What defines regular (uniform) speed in motion?

  • Covering equal distances in variable intervals of time
  • Covering variable distances in equal intervals of time
  • Covering equal distances in equal intervals of time (correct)
  • Covering unequal distances in unequal intervals of time

    • Which situation describes irregular (non-uniform) speed?

  • A train moving at a fixed speed between stations
  • A bicycle traveling downhill at a steady pace
  • A car moving at a constant speed on a highway
  • A person running the same distance at varying speeds (correct)

    • If a car moves at a regular speed of 70 Km/h, how far will it travel in half an hour?

  • 140 km
  • 70 km
  • 35 km (correct)
  • 15 km

    • What is the speed of the body if it covers 10 meters in 5 seconds?

    <p>2 m/sec</p> Signup and view all the answers

    What is the calculated distance (X) covered by a body moving at 2 m/sec in 15 seconds?

    <p>30 m</p> Signup and view all the answers

    How long (Y) does it take for a body to travel 50 meters at a speed of 2 m/sec?

    <p>25 sec</p> Signup and view all the answers

    In which situation does a moving object exhibit non-uniform speed?

    <p>A car steadily increasing speed while accelerating</p> Signup and view all the answers

    If a body covers 20 m in the first second, 20 m in the second second, and 20 m in the third second, which speed is depicted?

    <p>Regular speed</p> Signup and view all the answers

    What is the relationship between speed (V), distance (d), and time (t)?

    <p>Speed is directly proportional to distance when time is fixed.</p> Signup and view all the answers

    How many meters are there in 1 kilometer?

    <p>1000 meters</p> Signup and view all the answers

    If a sprinter runs at a speed of 6 m/sec for 10 seconds, how far does he run?

    <p>60 meters</p> Signup and view all the answers

    What is the speed in m/sec of a train that covers 50 meters in 2 seconds?

    <p>25 m/sec</p> Signup and view all the answers

    Convert a speed of 850 km/h to m/sec.

    <p>236.1 m/sec</p> Signup and view all the answers

    If a train covers a distance of 200 km at a speed of 40 km/h, what is the travel time?

    <p>5 hours</p> Signup and view all the answers

    Which unit is NOT commonly used to measure speed?

    <p>liters per second</p> Signup and view all the answers

    What is the resultant speed of a car moving at 20 m/sec converted to km/h?

    <p>72 km/h</p> Signup and view all the answers

    What is the average speed of the racer's entire trip?

    <p>2.2 m/s</p> Signup and view all the answers

    During which segment did the sprinter have the highest average speed?

    <p>First 100 meters</p> Signup and view all the answers

    If the real speed of an object is 100 km/h and the observer's speed is 50 km/h, what is the relative speed?

    <p>50 km/h less than the object's speed</p> Signup and view all the answers

    Under what condition does an object move with regular motion?

    <p>When its constant speed equals its average speed</p> Signup and view all the answers

    What happens to the relative speed when both the observer and the object move in the same direction at the same speed?

    <p>It becomes zero</p> Signup and view all the answers

    What is the average speed of the runner during the last 300 meters?

    <p>7.5 m/s</p> Signup and view all the answers

    How is relative speed typically affected when two objects are moving in opposite directions?

    <p>It is the sum of the speeds of both objects</p> Signup and view all the answers

    What can be concluded if an object's average speed is greater than its constant speed?

    <p>The motion is irregular</p> Signup and view all the answers

    What is the speed of light in km/sec?

    <p>3 x 10^8 km/sec</p> Signup and view all the answers

    How long does it take for sunlight to reach Earth?

    <p>8 minutes and 17 seconds</p> Signup and view all the answers

    What formula is used to determine the time needed for sunlight to reach Earth?

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

    What is the average speed of a car traveling 100 km in 1 hour?

    <p>100 km/h</p> Signup and view all the answers

    During a trip where speed is varied, how is average speed calculated?

    <p>Total distance covered divided by total time taken</p> Signup and view all the answers

    If a racer runs 100 meters in 10 seconds, what is their speed while running?

    <p>10 m/s</p> Signup and view all the answers

    How long did the racer take to return to the starting point walking?

    <p>80 seconds</p> Signup and view all the answers

    What best describes average speed?

    <p>Regular speed covering the same distance over the same period</p> Signup and view all the answers

    What defines the speed of a moving object?

    <p>The distance covered and the time taken</p> Signup and view all the answers

    If two cars cover the same distance but one does it in less time, which is true?

    <p>The faster car has a higher speed</p> Signup and view all the answers

    Which formula correctly expresses the relationship between speed, distance, and time?

    <p>V = d/t</p> Signup and view all the answers

    If two bikers take the same time to ride but one covers more distance, what can be inferred?

    <p>The biker covering more distance is faster</p> Signup and view all the answers

    How does decreasing the time taken to cover a fixed distance affect speed?

    <p>It increases speed</p> Signup and view all the answers

    In the scenario where a train and metro are both moving straight, which of the following is true?

    <p>They may move along a curved path</p> Signup and view all the answers

    What is the result if an object covers a greater distance while keeping the time constant?

    <p>The speed increases</p> Signup and view all the answers

    Which statement about two cars moving on the same path is correct?

    <p>The first car is faster if it covers the distance in less time</p> Signup and view all the answers

    Study Notes

    Motion and Speed

    • Motion is the change in an object's position relative to a fixed object over time.
    • Linear motion includes straight-line travel, such as trains and metros, which only move forward or backward but not up or down.
    • Speed can be interpreted as the distance covered in a specific time period: Speed = Distance/Time.
    • The first car that covered 10 km in 2 minutes is faster than the second car that took 5 minutes for the same distance.

    Key Concepts of Speed

    • Speed is based on two primary factors: distance covered and time taken.
    • An object moving the least amount of time has the highest speed, while longer distances covered in the same time indicate higher speeds.
    • Regular (uniform) speed is when equal distances are covered in equal intervals of time, while non-uniform speed occurs with variable distances over fixed time intervals.

    Units of Measurement

    • Speed is measured in km/h or m/s.
    • Conversion between km/h and m/s can be calculated using the factor 5/18.
    • Example: A speed of 20 m/s equals 72 km/h, while 90 km/h is equivalent to 25 m/s.

    Calculating Speed and Distance

    • Distance can be calculated as: Distance = Speed × Time.
      • Example: A sprinter running at 6 m/s for 10 seconds covers 60 meters.
    • Speed = Distance/Time can be applied to various scenarios, such as calculating speed from given distances and times.

    Average Speed

    • Average speed is the total distance covered divided by the total time taken.
    • For example, traveling 100 km in 1 hour results in an average speed of 100 km/h.

    Race Examples

    • A racer taking 10 seconds for 100 meters averages 10 m/s running but only 1.25 m/s when returning, resulting in an overall average speed of 2.2 m/s for the round trip.

    Relative Speed

    • Relative speed is the speed of an object as perceived by an observer, which changes depending on the observer's speed and direction.
    • If both the observer and the object are moving in the same direction, the relative speed is the difference between their speeds.

    Electromagnetic Wave Speed

    • Light travels at a constant speed of 3 × 10^8 m/s.
    • Time for sunlight to reach Earth is approximately 8 minutes and 17 seconds, covering a distance of 149 million km.

    Regular and Irregular Motion

    • An object has a regular motion when its speed is constant, meaning the constant speed equals the average speed (V = V).
    • Irregular motion occurs when the constant speed differs from average speed (V ≠ V).

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    Motion In One Direction PDF

    Description

    Explore the concept of motion in physics, focusing on how an object's position changes over time in relation to a fixed point. This quiz discusses various types of straight line motion, with examples from trains and metros, illustrating forward and backward movement as well as curved paths.

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