Motion in a Plane Questions

Motion in a plane is also called motion in two dimensions. Examples of motion in a plane include projectile motion and circular motion. For the analysis of such motion, the reference is an origin and two co-ordinate axes: X and Y-axis and scalar and physical vector quantities.

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Important Motion in a Plane Questions with Answers

1. When a particle moves in _____, all the three coordinates x, y and z will vary.

  1. one-dimension
  2. two-dimensions
  3. three-dimensions
  4. four-dimensions

Answer: c) Three-dimensions

Explanation: Motion in space that incorporates X-axis, Y-axis and Z-axis is known as three-dimensional motion.

2. Motion of a train along a straight railway track is an example of which type of motion?

  1. Motion in one-dimension
  2. Motion in two-dimension
  3. Motion in three-dimension
  4. None of the above options

Answer: a) Motion in one-dimension

Explanation: The motion of a train along a straight railway track is known as the motion in one dimension.

3. Motion along a straight line is known as ______

  1. Linear motion
  2. Rectilinear motion
  3. Circular motion
  4. Option a and b

Answer: d) Option a and b

Explanation: Motion along a straight line is known as linear motion or rectilinear motion.

4. Choose YES or NO: velocity gives the speed of an object in a particular direction.

  1. YES
  2. NO

Answer: a) YES

Explanation: Velocity is a vector quantity that gives direction as well as magnitude. It describes the speed of an object in a specific direction.

5. Give an example of two-dimensional motion.

An example of two-dimensional motion is the motion of a coin on a carrom board.

6. State true or false: Energy is not conserved in projectile motion.

  1. TRUE
  2. FALSE

Answer: b) FALSE

Explanation: Energy is conserved in a projectile motion.

7. Which of the following is an example of two-dimensional motion?

  1. A bird flying in the sky.
  2. An object falling close to Earth under gravity.
  3. Train moving on a straight railway track.
  4. A downstream or upstream motion of a boat in a river.

Answer: d) A downstream or upstream motion of a boat in a river.

Explanation: Among the given options, a) represents three-dimensional motion, and options b) and c) represent motion in a plane.

8. Fill in the blanks: v=

  1. u+a-t
  2. u+at
  3. u+a+t
  4. u-a-t

Answer: b) u+at

Explanation: v=u+at is the equation of motion in a straight line.

9. Initial velocity of the particle is represented using the alphabet _____

  1. v
  2. s
  3. u
  4. a

Answer: c) u

Explanation: Initial velocity of a particle is represented by ‘u’.

10. Choose YES or NO: Circular motion is an example of motion in two-dimension.

  1. YES
  2. NO

Answer: a) YES

Explanation: Projectile motion and circular motion represent motion in two-dimension.

Practice Questions

  1. Define motion.
  2. What is meant by velocity, acceleration and displacement?
  3. Give the equations for motion in a plane for the y-axis.
  4. What is a projectile motion?
  5. Give three examples of motion in a plane.

Watch the video below to learn about the projectile motion in detail.

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