CBSE Class 7 > Class 7 Notes > PPT - Motion and Time
PPT - Motion and Time
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FAQs on PPT - Motion and Time
| 1. What is the difference between speed and velocity in motion? |  |
Ans. Speed measures how fast an object moves regardless of direction, while velocity includes direction along with the rate of change of position. For example, a car travelling at 60 km/h has speed, but 60 km/h northward is its velocity. Understanding this distinction is crucial for Class 7 motion and time concepts, as velocity is a vector quantity while speed is scalar.
| 2. How do you calculate average speed if an object travels different distances in equal time intervals? | |
Ans. Average speed is calculated by dividing total distance travelled by total time taken. If an object covers 100 m in the first 10 seconds and 150 m in the next 10 seconds, total distance is 250 m and total time is 20 seconds, giving average speed of 12.5 m/s. This method works regardless of varying speeds during different intervals of motion.
| 3. What does uniform motion mean and how is it different from non-uniform motion? | |
Ans. Uniform motion occurs when an object travels equal distances in equal time intervals at constant speed, while non-uniform motion involves changing speed or direction. A car moving at steady 60 km/h on a straight road shows uniform motion; accelerating or decelerating demonstrates non-uniform motion. Recognising these patterns helps solve motion and time problems effectively for CBSE Class 7.
| 4. Why do we need both distance-time graphs and velocity-time graphs to understand motion? | |
Ans. Distance-time graphs show how position changes over time, revealing speed from the slope, while velocity-time graphs directly display speed variations and acceleration. A straight line in a distance-time graph indicates uniform motion, whereas a curve suggests acceleration. Together, these visual representations provide complete understanding of object movement in motion and time analysis.
| 5. How can you tell if an object is accelerating just by looking at a distance-time graph? | |
Ans. Acceleration appears as a curved line in a distance-time graph rather than a straight line. If the curve bends upward, the object accelerates; if it curves downward, the object decelerates. Steeper curves indicate faster acceleration. Students can use PPTs and mind maps available on EduRev to visualise these graphical representations and master motion analysis concepts easily.
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Document Description: PPT - Motion and Time for Class 7 2026 is part of Class 7 preparation. The notes and questions for PPT - Motion and Time have been prepared according to the Class 7 exam syllabus. Information about PPT - Motion and Time covers topics like and PPT - Motion and Time Example, for Class 7 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for PPT - Motion and Time.
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