Comprehensive Important Questions - NCERT Class 9 Motion Chapter
Prepare thoroughly with these essential conceptual and numerical questions from the NCERT Class 9 Motion chapter. Covering key topics to ensure better understanding and exam success.
Conceptual Questions
Q1: Define the terms scalar quantity and vector quantity with examples.
Q2: What is meant by uniform and non-uniform acceleration? Provide examples for each.
Q3: Explain the concept of relative velocity with an example.
Q4: A ball is thrown vertically upwards. Describe the motion of the ball during its upward and downward journey.
Q5: How does the slope of a velocity-time graph represent acceleration? What does the area under this graph represent?
Q6: Why is the motion of a satellite around the Earth considered to be accelerated motion?
Q7: Write and explain the three equations of motion. Mention the conditions under which they are applicable.
Q8: What is free fall? How does the value of acceleration due to gravity influence objects in free fall?
Numerical Questions
Q1: A cyclist covers a distance of 15 km in 30 minutes. Calculate the speed in m/s.
Q2: A car accelerates uniformly from rest to a speed of 20 m/s in 5 seconds. Find the distance traveled during this time.
Q3: A body moves in a straight line with an initial velocity of 5 m/s and an acceleration of 2 m/s². Find its velocity after 10 seconds and the distance covered.
Q4: A train travels a distance of 1200 m in 2 minutes and then stops. What is its average speed in km/h?
Q5: A ball is dropped from a height of 100 m. Find the time taken to reach the ground and the velocity just before hitting the ground. (Take g = 9.8 m/s²)
Q6: A car moving with a velocity of 50 km/h is stopped by applying brakes, which produces a uniform retardation of 5 m/s². Calculate the distance it will travel before coming to rest.
Q7: An object is thrown vertically upward with an initial velocity of 25 m/s. Calculate the time to reach maximum height, the maximum height reached, and the total time of flight. (Take g = 9.8 m/s²)
Q8: A truck traveling at 72 km/h slows down uniformly to 36 km/h in 10 seconds. Calculate the retardation and the distance covered during this period.
Tips for Scoring High
- Ensure you practice numerical problems daily to strengthen your problem-solving skills.
- Revisit graphs such as distance-time and velocity-time graphs, as they are frequently asked in exams.
- Understand the physical significance of concepts like acceleration, displacement, and free fall.
- Revise derivations for equations of motion and practice their applications in various situations.
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