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Motion Lessons
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Post a LessonAnswered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Motion
Nazia Khanum
i) Motion of a Car around a Curve:
ii) Motion of an Electron Orbiting around a Nucleus:
Answer to Question (b):
Given:
To Calculate:
Solution:
Convert the time from hours to seconds since speed is measured in meters per second.
Apply the formula for the speed of an object in circular motion:
Substitute the given values into the formula:
Result:
Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Motion
Nazia Khanum
Understanding Uniform and Non-Uniform Motion
Uniform Motion: Uniform motion refers to the movement of an object at a constant speed in a straight line, maintaining the same velocity throughout its journey. In this type of motion, the object covers equal distances in equal intervals of time.
Example of Uniform Motion:
Non-Uniform Motion: Non-uniform motion occurs when an object changes its speed or direction over time. Unlike uniform motion, the velocity of an object in non-uniform motion is not constant; it may vary at different points during its journey.
Example of Non-Uniform Motion:
Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Motion
Nazia Khanum
Understanding the Odometer and Speed
Introduction: The odometer is an essential component in automobiles, providing a measurement crucial for understanding the vehicle's distance traveled.
What Does the Odometer Measure? The odometer measures the total distance covered by the automobile since its manufacture or since the last reset. It is a significant indicator for vehicle maintenance, resale value, and tracking usage.
Comparison of Speeds: To determine which vehicle is moving faster, we need to compare the speeds of the scooter and the car.
Speed of the Scooter: (i) A scooter moving with a speed of 300 m per 1 minute.
Speed of the Car: (ii) A car moving with a speed of 36 km per hour.
Justification: To make a fair comparison, we need to ensure both speeds are in the same units. Let's convert the speed of the car from km/h to m/min:
Comparison: Comparing the speeds:
Conclusion: The car is moving faster than the scooter. It covers a distance of 600 meters in one minute compared to the scooter, which covers only 300 meters in the same time frame.
Therefore, the car moving at 36 km/h is faster than the scooter moving at 300 m/min.
Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Motion
Nazia Khanum
Solution to Car Travel Problem
Given Data:
Calculations:
i) Displacement of the Car:
Displacement is the straight-line distance between the initial and final positions.
Since the car returns to its initial position, the displacement is zero.
ii) Distance Traveled by the Car:
Distance traveled is the total path length covered.
Distance from A to B = Distance from B to A
Distance = Speed * Time
Total Distance = t(80 km/h)
iii) Average Speed of the Car:
Average speed is the total distance traveled divided by the total time taken.
Total Time Taken = Time taken from A to B + Time taken from B to A
Total Time Taken = t + t = 2t
Average Speed = Total Distance / Total Time Taken = [t(80 km/h)] / (2t)
Average Speed = 40 km/h
Summary:
Answered on 18/04/2024 Learn CBSE - Class 9/Science/Unit 3-Motion, Force and Work/Motion
Nazia Khanum
Understanding Velocity-Time Graph
Nature of Motion
Acceleration Calculation
Shape of Distance-Time Graph
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