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Important Points:
Motion: When an object changes its position with elapse of time in respect to a stationary object, such as a building, electric pole, etc., the object is said to be in motion.
Slow and Fast Motion: If an object A covers more distance and object B covers less distance in same time, then object A is called in Fast Motion and object B is called in Slow Motion.
Rectilinear Motion: Motion along a straight line is known as RECTILINEAR MOTION OR MOTION ALONG A STRAIGHT LINE.
Curvilinear Motion: Motion along a curve line is known as CURVILINEAR MOTION.
Circular Motion: Motion along a circle is known as CIRCULAR MOTION.
Speed: Distance covered by an object in unit time is called speed. This means Speed is equal to Distance upon Time.
Uniform Speed: If an object covers a fixed distance in each unit of time the motion is known as UNIFORM MOTION or UNIFORM SPEED.
Non-uniform Speed: If an object does not cover a fixed distance in each unit of time the motion is known as NON-UNIFORM MOTION or NON-UNIFORM SPEED.
Average Speed: Total distance covered divided by total time taken is known as AVERAGE SPEED.
Periodic Motion or Oscillatory Motion: When an object repeats its motion after every fixed interval of time, the motion of the object is called PERIODIC MOTION OR OSCILLATORY MOTION.
Oscillation: The motion of pendulum starting from one extreme end to another extreme end and back to the first extreme end is called one oscillation.
Time Period: Time taken to complete one oscillation by the pendulum is called time period.
Unit of Time: Time is measured in second.
Unit of speed: Unit of speed is meter/second (m/s).
Speedometer: A device used to measure the speed of a vehicle is called SPEEDOMETER.
Odometer: A device used to measure the distance covered by a vehicle.
Distance time graph of a moving vehicle with a constant speed is a straight slanting line. Speed-time graph for the same vehicle will be a straight line parallel to x-axis.
The document Important Points: Motion & Time | Science Class 7 is a part of the Class 7 Course Science Class 7.
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FAQs on Important Points: Motion & Time - Science Class 7
| 1. What is motion according to class 7? |  |
| 2. What is time according to class 7? | |
Ans. According to class 7, time is defined as the duration or interval between two events. It is measured in seconds, minutes, hours, days, etc.
| 3. What is the difference between speed and velocity? | |
Ans. Speed is the distance traveled by an object in a given time interval, whereas velocity is the displacement of an object in a given time interval. Velocity takes into account the direction of motion as well.
| 4. How is distance different from displacement? | |
Ans. Distance is the total path covered by an object, whereas displacement is the shortest distance between the initial and final position of an object. Distance is a scalar quantity, whereas displacement is a vector quantity.
| 5. What is uniform motion? | |
Ans. Uniform motion is the motion of an object at a constant speed in a straight line. In uniform motion, the distance covered by an object in equal time intervals is the same, and the speed of the object remains constant.
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