Last updated on September 8th, 2023 at 12:00 am

**Class 7 Motion and Time Extra Question Answers**

Class 7 Motion and Time Extra Question Answers | Class 7 Science NCERT Solutions | for all the students of CBSE / ICSE / State Board…

Fill in the blanks:

- A simple pendulum is made up of a â€¦â€¦â€¦â€¦&…………[
**bob and string**] - An â€¦â€¦â€¦â€¦â€¦ is a complete to-and-fro movement of a pendulum.[
**oscillation**] - One oscillation of a pendulum is called a â€¦â€¦â€¦[
**time period**] - A â€¦â€¦â€¦.measures short time intervals.
**[stopwatch**] - The basic unit of time is â€¦â€¦â€¦.[
**second**] - The distance between two cities is measured inâ€¦â€¦â€¦..[
**kilometers**] - Speed is a â€¦â€¦â€¦â€¦quantity. [
**scalar**] - Velocity is a â€¦â€¦â€¦â€¦.quantity. [
**vector**] - â€¦.records the distance moved by the vehicle.[
**Odometer**]

Answer the following question in short.

**What is the SI unit of speed?**

Meter per second

**Define speed. What is its SI unit?**

The distance covered by an object in unit time is called its speed. The speed of a moving object is expressed by the relation.The S. I. unit of speed = meter (m)

**Speed = Distance traveled/Time taken**

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**What is meant by uniform motion?**

When a body travels equal distances in equal intervals of time called uniform motion.

**Define nonuniform motion. Give one example.**

A body is said to have nonuniform motion when it travels unequal distances in equal intervals of time.

**What is motion? What is its SI unit of speed?**

The motion refers to changes in position over time. A meter per second is the SI unit of speed.

**What is an odometer? How does it work?**

An odometer is a device that records a vehicle’s total distance traveled. It is used to calculate the distance traveled on a particular trip.

**What is the difference between uniform and non-uniform motion?**

A uniform motion occurs when a body covers the same distance in equal intervals of time. Non-uniform motion occurs when a body moves unequally over an equal period of time.

**Describe the difference between velocity and speed.**

The rate at which a body moves is called its speed. Velocity is a measure of speed with direction.

**What is uniform motion? Give an example.**

Answer: Uniform motion is when an object travels at a constant speed in a straight line. An example of uniform motion is a car driving on a highway without changing its speed.

**What is distance? How is it different from displacement?**

Answer: Distance is the amount of space between two points. Displacement, on the other hand, is the change in position of an object in a particular direction. Distance is a scalar quantity and has no direction, while displacement is a vector quantity and has both magnitude and direction.

**What is non-uniform motion? Give an example.**

Answer: Non-uniform motion is when an object travels at varying speeds in a straight line or in a curved path. An example of non-uniform motion is a car moving through traffic, where its speed changes depending on the traffic conditions.

**How can we represent motion graphically?**

Answer: Motion can be represented graphically using distance-time and speed-time graphs. In a distance-time graph, time is plotted on the horizontal axis and distance is plotted on the vertical axis. In a speed-time graph, time is plotted on the horizontal axis and speed is plotted on the vertical axis.

**What is the formula for average speed?**

Answer: The formula for average speed is: Average Speed = Total Distance Traveled / Total Time Taken.

**Define the following terms.**

Velocity : An object’s velocity refers to its speed in a particular direction. The speed is usually measured in meters per second (m/s) or kilometers per hour (km/h).