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Motion and Time class 7 extra questions Download class 7 science extra questions 1. Answer the following What is the S.I unit of measurement for speed. What is a pendulum bob’s resting position called? What is the posture of the body called when it does not alter in relation to its surroundings? Name a device that measures the vehicle’s speed. Name a device that measures a vehicle’s distance traveled. What is the amount of time it takes a pendulum to complete one oscillation called? What is a pendulum’s metallic ball called? Name the material in which the crystals vibrate at an extremely rapid and accurate pace. Name a timepiece that uses the shadow of a pointer cast by the sun on a graded plate to display the time.   2. State True/False: A speedometer is an instrument to measure a vehicle’s speed at a particular speed. The speed of a car is always uniform. The kilometer is the SI unit of distance. Speed is a vector quantity. The speed of light is always faster than sound. 3. Match...

Class 7 Science Motion and Time What is motion? The motion of an object is defined as the change in its position with respect to time. When the position of an object does not change with respect to time, the object is said to be at rest or stationary.  What is the difference between uniform and non-uniform motion? The differences are- Uniform motion It is a type of motion wherein the object moves in a straight line. Its velocity remains unchanged along that straight line, irrespective of the time duration. It occupies equal distances at equal time intervals. Uniform motion has zero acceleration. The uniform motion and the actual speed of the object are identical. The equal distance at an equal interval of time. The distance to time graph is a straight line. Non-uniform motion Contrary to Uniform motion, Non-Uniform Motion is a type of motion wherein the object moves at different speeds and does not cover the same distance at equal time intervals, irrespective of the duration...