Study Materials

# NCERT Solutions for Class 7th Science

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## Chapter 13. Motion and Time

### Chapter Review

Chapter Review:

• The distance covered by an object in a unit time as the speed of the object.
• If the speed of an object moving along a straight line keeps changing, its motion is said to be non-uniform.
• An object moving along a straight line with a constant speed is said to be in uniform motion.
• The time taken by the pendulum to complete one oscillation is called its time period.
• The basic unit of time is a second.
• The speedometer of a car measure Speed.
• The odometer of a car measure Distance.
• The speed is the total distance covered divided by the total time taken is called average speed.
• The time between one sunrise and the next was called a day.
• A month was measured from one new moon to the next.
• A year was fixed as the time taken by the earth to complete one revolution of the sun.
• The metallic ball is called the bob of the pendulum.
• The to and fro motion of a simple pendulum is an example of a periodic or an oscillatory
motion.
• The smallest time interval that can be measured with commonly available clocks and watches is one second.

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