Untitled Quiz

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Questions and Answers

Is it possible for a moving body to have non-zero average speed but zero average velocity during any given interval of time? If so, explain.

Yes, it is possible. For example, if a body travels in a straight line at a constant speed and then returns to its starting point, it will have covered a distance but its displacement will be zero, resulting in a zero average velocity.
Yes, it is possible. For example, if a body moves in a circular path and returns to its starting point after completing one full revolution, its average speed will be non-zero as it has covered a distance, but its average velocity will be zero because its displacement is zero. (correct)
Yes, it is possible. For example, if a body travels in a straight line and returns to its starting point, its average speed will be non-zero as it has covered a distance, but its average velocity will be zero because its displacement is zero.
No, it's not possible. If a body has a non-zero average speed, it must also have a non-zero average velocity.

When we say that a bullock cart is moving at 10km h^-1 due south, what does it mean?

This means that the cart travels a distance of 10km in 1h in southward direction from its starting position.

A person strolls inside a train with a velocity of 1.0 m s^-1 in the direction of motion of the train. If the train is moving with a velocity of 3.0 m s^-1, calculate the person's velocity as seen by passengers in the compartment.

1.0 m s-1 (correct)
4.0 m s-1
3.0 m s-1
2.0 m s-1

What is the difference between instantaneous velocity and average velocity?

Instantaneous velocity is the velocity of an object at a specific moment in time. Average velocity is the overall velocity of an object over a period of time. Signup and view all the answers

Under what conditions is the average velocity of a body equal to its instantaneous velocity?

When the body is moving with a constant velocity. (C) Signup and view all the answers

Which of the following graphs is not possible? Give reason for your answer?

A position-time graph where the position of an object decreases with time, then remains constant, and finally increases again linearly with time. (C) Signup and view all the answers

What does the slope of the velocity-time graph at any instant represent?

The slope of the velocity-time graph at any instant represents the acceleration of the body at that instant. Signup and view all the answers

What type of motion does the adjoining graph represent: uniform motion, accelerated motion, or decelerated motion? Explain.

The graph represents decelerated motion. The velocity of the body is decreasing with time, which indicates that the body is slowing down. Signup and view all the answers

The ______ is used to calculate the position of an object after time t when it is undergoing constant acceleration a.

Second Equation of Motion Signup and view all the answers

A car A is travelling on a straight road with a uniform speed of 60 km h^-1. Car B is following it with uniform velocity of 70 km h^-1.When the distance between them is 2.5 km, the car B is given a decceleration of 20 km h^-1. At what distance and time will the car B catch up with car A?

Car B will catch up with car A at a distance of 32.5 km after 0.5 hours. (A) Signup and view all the answers

Flashcards

Distance

The total length of the path covered by an object.

Displacement

The shortest distance between the initial and final position of an object, with a direction.