Speed: 50m Dash MCQs Quiz | Class 9

This quiz covers Class: IX-X, Subject: Health and Physical Education (HPE), Unit: 4. Physical Fitness Test Battery, and focuses on the Topic: Speed: 50m Dash. It includes questions on covering topics such as Acceleration and Speed. Test your knowledge, then submit your answers to see your score and download a detailed answer PDF!

Understanding Speed: The 50m Dash and Its Components

The 50-meter dash is a fundamental physical fitness test designed to measure an individual’s acceleration and maximum running speed over a short distance. It is a key component in assessing athletic potential, particularly in sports requiring bursts of speed and quick movements.

Key Concepts

1. Speed

In physics and sports, speed refers to the rate at which an object covers distance. In the context of the 50m dash, it’s how quickly a runner can cover the 50-meter distance. It is calculated using the formula: Speed = Distance / Time. For example, if you run 50 meters in 8 seconds, your average speed is 50m / 8s = 6.25 meters per second (m/s).

2. Acceleration

Acceleration is the rate at which an object’s velocity changes. In a sprint, acceleration is crucial in the initial phase, where the runner transitions from a stationary position to their maximum speed. Good acceleration means reaching top speed quickly and efficiently. It is calculated using the formula: Acceleration = Change in Velocity / Time. For instance, if a runner increases their speed from 0 m/s to 7 m/s in 2 seconds, their average acceleration is (7 m/s – 0 m/s) / 2 s = 3.5 meters per second squared (m/s^2).

Phases of the 50m Dash

  • Start Phase: This involves the reaction time to the starting signal and the initial powerful push-off from the blocks or ground. A strong, explosive start is critical for immediate acceleration.
  • Acceleration Phase: From the initial push, the runner gradually increases their speed, striving to reach their maximum velocity within the first 20-30 meters. This phase heavily relies on leg power and efficient running mechanics.
  • Maximum Speed Phase: Once peak velocity is attained, the runner tries to maintain this speed for the remainder of the dash. This requires sustained effort and good running form to resist deceleration caused by fatigue or air resistance.

Factors Influencing 50m Dash Performance

Several factors can significantly impact a runner’s performance in the 50m dash:

  • Reaction Time: The speed at which a runner responds to the start signal.
  • Leg Power: The strength and explosiveness of leg muscles to drive off the start and accelerate.
  • Running Technique: Efficient arm swing, high knee drive, and appropriate body lean contribute significantly to overall speed and acceleration.
  • Body Composition: A leaner body mass generally favors improved speed and agility.
  • Specific Training: Incorporating speed and power training, such as plyometrics, strength training, and targeted sprint drills, is essential for performance enhancement.

Table: Comparison of Speed and Acceleration

Feature Speed Acceleration
Definition Rate of covering distance Rate of change of velocity
Formula Distance / Time Change in Velocity / Time
Unit meters per second (m/s) meters per second squared (m/s^2)
Key Role in 50m Overall performance, maintaining pace Initial burst, reaching max speed quickly

Quick Revision Points

  • The 50m dash primarily measures an individual’s speed and ability to accelerate.
  • Speed is calculated as Distance divided by Time.
  • Acceleration is the change in Velocity divided by Time.
  • A successful sprint involves an explosive start, efficient acceleration to maximum speed, and maintaining that speed.
  • Training programs focused on power, strength, and correct technique are crucial for improving 50m dash times.

Extra Practice Questions

  1. What is the main goal of the acceleration phase in a short sprint?
    1. To conserve energy
    2. To reach maximum speed quickly
    3. To cool down
    4. To practice endurance
  2. If two runners cover 50 meters, but Runner A takes 6.5 seconds and Runner B takes 7.2 seconds, who has a higher average speed?
    1. Runner A
    2. Runner B
    3. Both have the same speed
    4. Cannot be determined
  3. Which physical component is most directly linked to developing explosive power for acceleration?
    1. Cardiovascular endurance
    2. Muscular strength and power
    3. Flexibility
    4. Balance
  4. Why is a crouch start generally preferred over a standing start for the 50m dash?
    1. It’s more comfortable
    2. It allows for better balance at the finish line
    3. It enables a more powerful initial push and better acceleration
    4. It reduces the risk of injury
  5. A car accelerates from rest (0 km/h) to 60 km/h in 5 seconds. This change in speed over time is an example of what?
    1. Constant speed
    2. Deceleration
    3. Acceleration
    4. Velocity