Motion in a Plane-Practice Questions with Answers & Explanations

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.

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.