Worksheet 10: Class 6 Science - Motion and Measurement of Distances

Welcome! This worksheet will help you understand how things move and how we measure how far they go. We will explore different types of motion and learn why having standard units of measurement is so important. Let's get started!

Motion and Measurement

We see objects moving all around us. **Motion** is simply a change in an object's position over time. Motion can be of different types:

• **Rectilinear Motion:** This is movement in a straight line, like a car on a straight road.
• **Circular Motion:** This is movement along a circular path, like a stone tied to a string and swung around.
• **Periodic Motion:** This is motion that repeats itself after a fixed period of time, like the swinging of a pendulum.

To describe motion, we need to be able to measure distances. In the past, people used body parts like the foot or cubit to measure. However, this caused confusion because everyone's body parts are different sizes. To solve this problem, standard units of measurement were developed. The **International System of Units (SI Units)** is now used worldwide.

The standard unit of length is the **meter (m)**. Other units, like the **centimeter (cm)** and **kilometer (km)**, are related to the meter. A kilometer is a longer unit for measuring large distances, while a centimeter is a smaller unit for measuring short distances.

Practice Questions

1. Fill in the blank: The SI unit of length is the _____.

Meter

2. True or False: The motion of a spinning top is an example of rectilinear motion.

False. The motion of a spinning top is an example of rotational motion.

3. Match the type of motion with its example:

(a) Motion of a pendulum (i) Rectilinear Motion

(b) A car moving on a straight road (ii) Circular Motion

(c) A wheel of a bicycle (iii) Periodic Motion

a - iii, b - i, c - ii

4. Why is it important to use standard units of measurement?

Standard units ensure that everyone gets the same measurement, avoiding confusion and making communication precise and reliable.

5. Fill in the blank: One kilometer is equal to _____ meters.

1000

6. What is the difference between rectilinear motion and circular motion?

**Rectilinear motion** is movement in a straight line, while **circular motion** is movement along a circular path.

7. Name two older, non-standard methods of measurement.

The cubit (the length from the elbow to the fingertips) and the foot.

8. What is the correct way to measure the length of an object with a scale?

You should place the starting point of the object at the zero mark of the scale and read the measurement with your eye directly above the point you are measuring to avoid errors.