Q: Q2: What are the types of motion?

The three main types of motion are: 1. Uniform Motion – An object covers equal distances in equal time intervals. 2. Non-Uniform Motion – The distance covered by an object varies in equal time intervals. 3. Periodic Motion – Motion that repeats after a fixed interval of time (e.g., pendulum, Earth’s revolution).

Q: Q5: What is the SI unit of speed?

The SI unit of speed is meter per second (m/s) . Other common units are kilometer per hour (km/h) and miles per hour (mph) .

Q: Q6: What is uniform motion? Give an example.

Uniform motion occurs when an object moves at a constant speed , covering equal distances in equal time intervals. Example: A train moving at a constant speed of 80 km/h.

Q: Q7: What is non-uniform motion? Give an example.

Non-uniform motion occurs when an object moves with changing speed , covering different distances in equal time intervals. Example: A car moving in traffic, where its speed varies.

Q: Q10: What is a distance-time graph?

A distance-time graph shows how distance changes over time. It helps us understand whether an object is in motion and whether the motion is uniform or non-uniform.

Question 1

Q1: What is motion?

Accepted Answer

Motion is the change in position of an object with respect to time. If an object does not change its position, it is said to be at rest.

Question 2

Q2: What are the types of motion?

Accepted Answer

The three main types of motion are:
1. Uniform Motion – An object covers equal distances in equal time intervals.
2. Non-Uniform Motion – The distance covered by an object varies in equal time intervals.
3. Periodic Motion – Motion that repeats after a fixed interval of time (e.g., pendulum, Earth’s revolution).

Question 3

Q3: What is speed?

Accepted Answer

Speed is the distance traveled by an object in a given time. It shows how fast or slow an object moves.

Question 4

Q4: What is the formula for speed?

Accepted Answer

The formula for speed is:
Speed = Distance / Time

Question 5

Q5: What is the SI unit of speed?

Accepted Answer

The SI unit of speed is meter per second (m/s). Other common units are kilometer per hour (km/h) and miles per hour (mph).

Question 6

Q6: What is uniform motion? Give an example.

Accepted Answer

Uniform motion occurs when an object moves at a constant speed, covering equal distances in equal time intervals.
Example: A train moving at a constant speed of 80 km/h.

Question 7

Q7: What is non-uniform motion? Give an example.

Accepted Answer

Non-uniform motion occurs when an object moves with changing speed, covering different distances in equal time intervals.
Example: A car moving in traffic, where its speed varies.

Question 8

Q8: How do we measure time?

Accepted Answer

Time is measured using clocks, stopwatches, and timers. The SI unit of time is seconds (s).

Question 9

Q9: What is the importance of motion and time in daily life?

Accepted Answer

Motion and time help in:
1. Measuring speed in vehicles.
2. Determining travel duration.
3. Understanding planetary movement.
4. Sports and athletics timing.

Question 10

Q10: What is a distance-time graph?

Accepted Answer

A distance-time graph shows how distance changes over time. It helps us understand whether an object is in motion and whether the motion is uniform or non-uniform.

Question 11

Q11: What is the difference between speed and velocity?

Accepted Answer

Speed is a scalar quantity (it has only magnitude), while velocity is a vector quantity (it has both magnitude and direction).

Question 12

Q12: How do we convert km/h into m/s?

Accepted Answer

To convert km/h to m/s, use this formula:
1 km/h = (5/18) m/s
Example:
36 km/h = 36 × 5/18
= 10 m/s

Question 13

Q13: Why do we need to measure time in experiments?

Accepted Answer

Time measurement is crucial in experiments to calculate speed, velocity, and acceleration accurately.

Question 14

Q14: What is acceleration?

Accepted Answer

Acceleration is the rate of change of velocity over time. It occurs when an object speeds up, slows down, or changes direction.

Question 15

Q15: What are some real-life examples of motion?

Accepted Answer

Examples of motion in daily life:
1. A moving car or bus.
2. A child running in the park.
3. A swinging pendulum.
4. The Earth’s revolution around the Sun.

Motion and Time Class 7 Science Best Notes

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