Very Short Question and Answers - Rate of Change of Velocity

Q 1.

What is uniform acceleration?

Ans:

Uniform acceleration occurs when a body changes its velocity by equal amounts in equal intervals of time.

Q 2.

What is non-uniform acceleration?

Ans:

Non-uniform acceleration occurs when a body changes its velocity by unequal amounts in equal intervals of time.

Q 3.

What is the formula for acceleration?

Ans:

Acceleration is calculated using the formula: a = (v - u) / t, where v is the final velocity, u is the initial velocity, and t is the time taken.

Q 4.

What are the SI units of acceleration?

Ans:

The SI unit of acceleration is meters per second squared (m/s²).

Q 5.

What happens to acceleration when velocity is constant?

Ans:

When velocity is constant, the acceleration is zero as there is no change in velocity.

Q 6.

What is the initial velocity if an object starts from rest?

Ans:

If an object starts from rest, its initial velocity (u) is 0 m/s.

Q 7.

Calculate the acceleration of a bus that decreases its speed from 80 km/h to 60 km/h in 5 seconds.

Ans:

To convert km/h to m/s: 80 km/h = 22.22 m/s and 60 km/h = 16.67 m/s. Then, acceleration a = (16.67 - 22.22) / 5 = -1.11 m/s².

Q 8.

What is the acceleration of a train that starts from rest and reaches a speed of 40 km/h in 10 minutes?

Ans:

Conversion: 40 km/h = 11.11 m/s. Acceleration a = (11.11 - 0) / 600 = 0.0185 m/s².

Q 9.

What type of acceleration is it when a bicycle is speeding up on a straight path?

Ans:

It is an example of positive uniform acceleration if the speed increases consistently.

Q 10.

Describe a scenario illustrating negative acceleration.

Ans:

A scenario illustrating negative acceleration is when a car is applying brakes, reducing its speed over time.

Q 11.

Is freely falling body motion an example of uniform acceleration?

Ans:

Yes, the motion of a freely falling body is an example of uniformly accelerated motion, with a constant acceleration due to gravity.

Q 12.

How do you determine if acceleration is in the direction of motion?

Ans:

Acceleration is in the direction of motion when the velocity of the object is increasing, indicating positive acceleration.

Q 13.

What is uniform motion?

Ans:

Uniform motion occurs when an object moves at a constant speed in a straight line without changing its velocity.

Q 14.

Explain an example of non-uniform motion.

Ans:

An example of non-uniform motion is a car driving through city traffic where it frequently accelerates and decelerates.

Q 15.

Can you give an example of uniform acceleration from daily life?

Ans:

An example of uniform acceleration is a smooth ride in an elevator that gradually speeds up at a constant rate.

Q 16.

What can be said about the acceleration of an object if it is slowing down?

Ans:

If an object is slowing down, it has negative acceleration (deceleration).

Q 17.

In what situation would you experience non-uniform acceleration?

Ans:

Experiencing non-uniform acceleration can occur in a car that accelerates quickly, then slows down suddenly, and resumes a variable speed.

Q 18.

How does the acceleration of an object affect its velocity?

Ans:

Acceleration affects velocity by changing the speed of the object; positive acceleration increases speed while negative acceleration decreases speed.

Q 19.

State one practical application of understanding acceleration.

Ans:

Understanding acceleration is vital for designing vehicles and ensuring safety features like anti-lock braking systems.

Q 20.

Define acceleration in simple terms.

Ans:

Acceleration is the rate at which an object changes its velocity over time.

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