# Class 7 Motion and Time Extra Question Answers

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:

1. A simple pendulum is made up of a â€¦â€¦â€¦â€¦&…………[ bob and string]
2. An â€¦â€¦â€¦â€¦â€¦ is a complete to-and-fro movement of a pendulum.[oscillation]
3. One oscillation of a pendulum is called a â€¦â€¦â€¦[time period]
4. A â€¦â€¦â€¦.measures short time intervals.[stopwatch]
5. The basic unit of time is â€¦â€¦â€¦.[second]
6. The distance between two cities is measured inâ€¦â€¦â€¦..[kilometers]
7. Speed is a â€¦â€¦â€¦â€¦quantity. [scalar]
8. Velocity is a â€¦â€¦â€¦â€¦.quantity. [vector]
9. 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

Â

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).

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