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Very Short Question and Answers - Measuring the Rate of Motion

Q 1.
What is speed?

Ans:

Speed is the rate at which an object covers distance, measured as the distance travelled per unit time.

Q 2.
What is the SI unit of speed?

Ans:

The SI unit of speed is metres per second (m/s).

Q 3.
Define average speed.

Ans:

Average speed is the total distance travelled divided by the total time taken.

Q 4.
How is average speed calculated?

Ans:

Average speed is calculated using the formula: Average speed = Total distance travelled / Total time taken.

Q 5.
If a car travels 150 km in 3 hours, what is its average speed?

Ans:

Average speed = 150 km / 3 h = 50 km/h.

Q 6.
What is the difference between speed and velocity?

Ans:

Speed is a scalar quantity referring to how fast an object moves, while velocity is a vector quantity that includes both speed and direction.

Q 7.
What does it mean if an object's speed changes?

Ans:

If an object's speed changes, it is said to be in non-uniform motion.

Q 8.
How can average velocity be defined?

Ans:

Average velocity is the displacement divided by the total time taken.

Q 9.
What is uniform motion?

Ans:

Uniform motion is the motion of an object where it travels equal distances in equal intervals of time.

Q 10.
In a situation where an object returns to its original position, what is its average velocity?

Ans:

The average velocity of the object is zero since there is no displacement.

Q 11.
What does an odometer measure?

Ans:

An odometer measures the total distance traveled by a vehicle.

Q 12.
In the example where a signal travels at the speed of light, how far is the spaceship if the signal takes five minutes to reach Earth?

Ans:

Distance = Speed × Time = (3 × 10^8 m/s) × (5 × 60 s) = 9 × 10^10 m.

Q 13.
How do you convert speed from km/h to m/s?

Ans:

To convert from km/h to m/s, multiply by 1000 (to convert km to m) and divide by 3600 (to convert h to s).

Q 14.
If Usha swims 180 m and returns to her starting point in one minute, what is her average velocity?

Ans:

Usha's average velocity = Displacement / Time = 0 m / 60 s = 0 m/s.

Q 15.
What happens to the average speed when an object travels varying speeds?

Ans:

The average speed is calculated based on the total distance and total time, thus it may differ from the speeds at individual moments.

Q 16.
What would indicate that an object is in non-uniform motion?

Ans:

If the object is covering different distances in equal time intervals or changing its speed or direction.

Q 17.
What is meant by average velocity?

Ans:

Average velocity refers to the total displacement divided by the total time taken.

Q 18.
What is the average speed of a biker who covers 40 km in 2 hours?

Ans:

Average speed = 40 km / 2 h = 20 km/h.

Q 19.
Explain what happens to the speed if an object travels a smaller distance in a longer time.

Ans:

The average speed will decrease as the distance travelled decreases relative to the time taken.

Q 20.
When might average speed be different from instantaneous speed?

Ans:

Average speed may differ from instantaneous speed when an object accelerates or decelerates during its motion.

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