Motion and Stationary Objects
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Questions and Answers

What is the displacement of a man who travels from point A to point C if the straight-line distance AC is 4 km East?

  • 8 km
  • 4 km
  • 4 km East (correct)
  • 8 km East

    • Considering a car travels a distance of 50 km eastwards, which statement correctly represents this travel?

  • Displacement is a scalar quantity
  • Distance is a vector quantity
  • 50 km is the distance travelled (correct)
  • 50 km is the displacement

    • Why is displacement considered a vector quantity?

  • It has both magnitude and direction (correct)
  • It is always positive
  • Because it depends on the path taken
  • It is measured in kilometers

    • What is the total distance travelled by a man who walks 5 km north, 3 km east, and 4 km south?

    <p>12 km</p> Signup and view all the answers

    Which of the following statements is true about distance?

    <p>Distance has no direction</p> Signup and view all the answers

    In Example 2, where the man travels around a circular track, what is the displacement if he starts and ends at point A?

    <p>0</p> Signup and view all the answers

    Which of these is an example of a scalar quantity?

    <p>Distance</p> Signup and view all the answers

    How do you calculate the distance travelled in a circular track?

    <p>$2πr$</p> Signup and view all the answers

    What is the displacement of a vehicle that travels from town A to town B via a tunnel?

    <p>10 km</p> Signup and view all the answers

    Which physical quantity is described by a magnitude of 4 km in the East direction?

    <p>Displacement</p> Signup and view all the answers

    If a man travels from point A to point C via point B, what represents his displacement?

    <p>Shortest straight-line distance from A to C</p> Signup and view all the answers

    Which description most accurately defines a scalar quantity?

    <p>A physical quantity having only magnitude</p> Signup and view all the answers

    What is the total distance traveled when a body moves from A to B, B to C, and back to A, if AB = 5 km, BC = 3 km, and CA = 4 km?

    <p>12 km</p> Signup and view all the answers

    Which scenario demonstrates a zero displacement despite the object traveling a certain distance?

    <p>Travel in a circle and return to the starting point</p> Signup and view all the answers

    If a car moves 50 km towards the East in a straight line, what is the distance and displacement respectively?

    <p>50 km and 50 km towards East</p> Signup and view all the answers

    What is the nature of a vector quantity?

    <p>It has both magnitude and direction</p> Signup and view all the answers

    What is the defining characteristic of uniform motion?

    <p>Travelling equal distances in equal intervals of time</p> Signup and view all the answers

    Which of the following is true for non-uniform motion?

    <p>The distance-time graph is a curved line</p> Signup and view all the answers

    Which scenario is NOT an example of non-uniform motion?

    <p>A car travelling at constant speed</p> Signup and view all the answers

    What term is also used to describe non-uniform motion?

    <p>Accelerated motion</p> Signup and view all the answers

    What type of graph represents the motion of a body in uniform motion?

    <p>Straight line</p> Signup and view all the answers

    Which of these statements is correct about a freely falling ball?

    <p>It travels unequal distances in equal time intervals</p> Signup and view all the answers

    What happens to the distance travelled by a train approaching a station per second?

    <p>It decreases</p> Signup and view all the answers

    How do we determine the type of motion a body has?

    <p>By drawing the distance-time graph</p> Signup and view all the answers

    If a man travels 10 km north, then 6 km east, and finally 10 km south, what is his total distance travelled?

    <p>26 km</p> Signup and view all the answers

    A person travels 4 km west and then 3 km north. What is the final displacement?

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

    If you walk around a circular track with a radius of 10 meters and return to your starting point, what will be your displacement?

    <p>0 meters</p> Signup and view all the answers

    A man starts at point A, travels 8 km east, 6 km north, and finally 8 km west. What is his total travel distance?

    <p>22 km</p> Signup and view all the answers

    A person walks 5 m north, 3 m east, and 2 m south. What is the magnitude of the resultant displacement?

    <p>4 m</p> Signup and view all the answers

    If you travel in a straight line from point A to point B in 3 seconds and then return to point A in another 3 seconds, what is your average velocity?

    <p>Zero</p> Signup and view all the answers

    Which statement about distance and displacement is correct?

    <p>Displacement can be zero while distance cannot be zero.</p> Signup and view all the answers

    A person travels 4 m north-east directly. What is the person's displacement?

    <p>4 m</p> Signup and view all the answers

    Which of the following can be considered as stationary objects?

    <p>Electric poles</p> Signup and view all the answers

    What characteristic is common to all moving bodies?

    <p>They change their position with time.</p> Signup and view all the answers

    Under which condition can we say that a body is in motion?

    <p>When its position changes continuously with respect to a stationary object taken as a reference.</p> Signup and view all the answers

    Which of these statements best defines motion?

    <p>When a body changes its position continuously with respect to a stationary object.</p> Signup and view all the answers

    Which of the following objects is NOT in motion according to the content?

    <p>A parked car</p> Signup and view all the answers

    What is the reference point used to determine if an object is in motion?

    <p>A stationary object</p> Signup and view all the answers

    What is the average speed of sound in air at 20°C?

    <p>344 m/s</p> Signup and view all the answers

    Which moving object has an average speed of 5 to 15 m/s?

    <p>Birds</p> Signup and view all the answers

    How much faster is the speed of light in vacuum compared to a military jet aircraft?

    <p>600 times faster</p> Signup and view all the answers

    What is the average walking speed of a human in meters per second?

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

    Which moving object has an average speed of 216 km/h?

    <p>Racing car</p> Signup and view all the answers

    If a sprinter runs 100 meters in 10 seconds, what is their average speed?

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

    What is the SI unit of speed?

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

    If a car travels 150 kilometres in 5 hours, what is its average speed?

    <p>30 km/h</p> Signup and view all the answers

    Which instrument on a car measures the distance travelled?

    <p>Odometer</p> Signup and view all the answers

    How is speed classified as a physical quantity?

    <p>Scalar quantity because it has no specified direction</p> Signup and view all the answers

    Why must speeds of different bodies be expressed in the same units for comparison?

    <p>To make accurate comparisons</p> Signup and view all the answers

    Which formula represents the relationship between speed, distance, and time?

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

    Which of the following units is not typically used for expressing speed?

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

    A car’s speed is shown by which instrument?

    <p>Speedometer</p> Signup and view all the answers

    If a man travels from point $A$ to point $B$ (5 km) and then to point $C$ (3 km), what is the displacement from $A$ to $C$?

    <p>4 km towards East</p> Signup and view all the answers

    A car moves from point $A$ to point $B$ and back to point $A$. What is its displacement?

    <p>0</p> Signup and view all the answers

    Which of these describes a scalar quantity?

    <p>Magnitude only</p> Signup and view all the answers

    Why can't the movement of the hour's hand of a clock be observed easily?

    <p>It moves very slowly</p> Signup and view all the answers

    Which of the following is a vector quantity?

    <p>Displacement</p> Signup and view all the answers

    If a pendulum completes 10 full swings, what is its displacement from its starting point?

    <p>Zero</p> Signup and view all the answers

    How far does a man travel if he walks 5 km north, then 3 km east?

    <p>8 km</p> Signup and view all the answers

    Which type of movement is difficult to observe due to its slow speed?

    <p>Hour's hand of a watch</p> Signup and view all the answers

    What term describes the actual length of the path covered by a moving body?

    <p>Distance</p> Signup and view all the answers

    If a car's position is continuously changing with respect to a stationary object, what can be said about the car?

    <p>The car is moving</p> Signup and view all the answers

    What is the speed of a body if it travels 2 kilometers in 4 minutes in centimeters per second?

    <p>833.33 cm/s</p> Signup and view all the answers

    An object has a uniform speed of 45 km/h. How far will it travel in 40 minutes?

    <p>27 km</p> Signup and view all the answers

    A cyclist covers 15 km in 1.5 hours. What is his speed in meters per second?

    <p>2.78 m/s</p> Signup and view all the answers

    The distance travelled by a body moving at a uniform speed is directly proportional to which of the following?

    <p>The time intervals considered</p> Signup and view all the answers

    If a car travels 75 km in 1.5 hours, what is its speed in km/h?

    <p>60 km/h</p> Signup and view all the answers

    Convert a speed of 1500 cm/s to km/h.

    <p>54 km/h</p> Signup and view all the answers

    A vehicle covers a distance of 150 meters in 10 seconds. What is its speed in kilometers per hour?

    <p>54 km/h</p> Signup and view all the answers

    A train travels at a speed of 90 km/h. How long will it take to travel 225 kilometers?

    <p>2.5 hours</p> Signup and view all the answers

    What is the time in seconds taken for a scooterist to travel 3000 meters in 5 minutes?

    <p>300 seconds</p> Signup and view all the answers

    What is the speed of the scooterist in meters per second (m/s) if they traveled 3000 meters in 5 minutes?

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

    When converting the speed from meters per second to kilometers per hour, what is the resulting speed?

    <p>36 km/h</p> Signup and view all the answers

    If the distance traveled by the scooterist is 3 kilometers and the time taken is 0.083 hours, what is the speed in kilometers per hour (km/h)?

    <p>36 km/h</p> Signup and view all the answers

    What should be done to ensure drivers adhere to the speed limit indicated by road signs?

    <p>Using speed guns to monitor speeds</p> Signup and view all the answers

    What penalty do drivers face if they are caught exceeding the speed limit by a traffic police officer using a speed gun?

    <p>Fines</p> Signup and view all the answers

    Study Notes

    Motion

    • A body is said to be in motion when its position changes continuously with respect to a stationary object taken as a reference point.
    • The movement of a body (or object) is called motion.
    • All bodies that do not remain stationary, such as animals, birds, cars, buses, trains, ships, and aeroplanes, are in motion.

    Distance and Displacement

    • Distance travelled by a body is the actual length of the path covered by a moving body, regardless of direction.
    • Displacement of a body is the shortest distance between the initial and final positions of the body, along with direction.
    • Distance is a scalar quantity (has only magnitude, no direction).
    • Displacement is a vector quantity (has both magnitude and direction).

    Examples

    • A man travels a distance of 5 km to reach point B, then 3 km to reach point C, and finally 4 km to reach point A. The distance travelled is 5 + 3 + 4 = 12 km, and the displacement is 4 km towards East.
    • A car travels a distance of 50 km, and if it is travelling in a straight line in the East direction, the displacement is 50 km towards East.

    Uniform and Non-Uniform Motion

    • A body has uniform motion if it travels equal distances in equal intervals of time, no matter how small these intervals may be.
    • A body has non-uniform motion if it travels unequal distances in equal intervals of time.
    • Examples of non-uniform motion include a freely falling body and a train starting from a railway station.

    Speed, Velocity, and Acceleration

    • Speed is the distance travelled by a body per unit time.
    • Speed of a body can be calculated by dividing the distance travelled by the time taken to travel that distance.
    • The SI unit of speed is metres per second (m/s).
    • Speed has magnitude only, no direction, so it is a scalar quantity.

    Average Speed

    • Average speed of a body is the total distance travelled divided by the total time taken to cover that distance.
    • Formula for average speed: Average Speed = Total Distance Travelled / Total Time Taken.
    • Average speed is used when the speed of a body is not constant.

    Examples of Speeds

    • Tortoise: 0.06 m/s or 0.216 km/h

    • Human walking: 2 m/s or 7.2 km/h

    • Human running (sprinter): 10 m/s or 36 km/h

    • Birds: 5 to 15 m/s or 18 to 54 km/h

    • Cheetah: 27 m/s or 97.2 km/h

    • Fast car: 30 m/s or 108 km/h

    • Racing car: 60 m/s or 216 km/h

    • Sound in air (at 20°C): 344 m/s or 1238.4 km/h

    • Jet aeroplane: 500 m/s or 1800 km/h

    • Light (in vacuum): 3 x 10^8 m/s or 1.08 x 10^9 km/h### Calculating Speed

    • The scooterist travelled 3000m in 5 minutes, which is equivalent to 300 seconds.

    • The formula for speed is speed = distance/time, where the scooterist's speed is calculated as 3000m / 300s = 10m/s.

    • To express the speed in kilometers per hour, the distance is converted to kilometers (3km) and the time to hours (0.083 hours), resulting in a speed of 3km / 0.083 hours = 36km/h.

    Road Signs and Speed Limits

    • A road sign displays a speed limit of 40 km/h, promoting driving within the specified limits for personal safety and the safety of others.

    Speed Guns and Traffic Enforcement

    • Traffic police officers use speed guns to determine the speed of vehicles, enforcing traffic laws and deterring drivers from exceeding the speed limit.
    • Drivers caught exceeding the speed limit face penalties, such as fines.

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    Understanding the difference between stationary objects and moving objects, including examples from everyday life.

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