Chapter-Chapter 8. Measurement of Time and Motion Science Curiosity class 7 in english Medium CBSE Notes

Chapter 8: Measurement of Time and Motion

Definitions:

Motion: Motion is the change in position of an object with respect to time.

Rest: An object is said to be at rest if it does not change its position with time.

Distance: Distance is the total length of the path covered by an object.

Time: Time is the duration in which an event occurs.

Speed: Speed is the distance travelled by an object in a unit time.

Uniform Motion: Uniform motion is when an object covers equal distances in equal intervals of time.

Non-uniform Motion: Non-uniform motion is when an object covers unequal distances in equal intervals of time.

Rectilinear Motion: Motion in a straight line is called rectilinear motion.

Circular Motion: Motion along a circular path is called circular motion.

Periodic Motion: Motion that repeats at regular intervals is called periodic motion.

Odometer: An odometer is a device used to measure the distance travelled by a vehicle.

Stopwatch: A stopwatch is a device used to measure short intervals of time.

Quick Revision Points:

• Motion is the change in position with time.
• Distance is the total path covered.
• Time helps measure duration of events.
• Speed = Distance ÷ Time.
• Uniform motion has constant speed.
• Non-uniform motion has changing speed.
• Rectilinear motion is straight-line motion.
• Circular motion follows a circular path.
• Periodic motion repeats at regular intervals.
• Odometer measures distance in vehicles.
• Stopwatch measures short time intervals.

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