Motion in a Plane XI

Question 1

What is the definition of displacement in motion?

Answer 1

Displacement is the vector quantity that represents the change in position of an object.

Question 2

Which of the following represents a scalar quantity? A) Displacement B) Velocity C) Speed D) Acceleration

Answer 2

C) Speed

Question 3

True or False: Velocity can be negative.

Answer 3

True

Question 4

Fill in the blank: The formula for average velocity is _____ .

Answer 4

(Final position - Initial position) / Time interval

Question 5

What is the unit of acceleration?

Answer 5

meters per second squared (m/s²)

Question 6

If an object is moving in a circular path, what type of acceleration is it experiencing?

Answer 6

Centripetal acceleration

Question 7

Which of the following equations relates displacement, initial velocity, final velocity, acceleration, and time? A) v = u + at B) s = ut + 1/2 at² C) s = vt - 1/2 at² D) All of the above

Answer 7

D) All of the above

Question 8

What does the slope of a velocity-time graph represent?

Answer 8

Acceleration

Question 9

A car travels 100 meters north in 5 seconds. What is its average speed?

Answer 9

20 m/s

Question 10

True or False: An object can have a constant speed while having a changing velocity.

Answer 10

True

Question 11

What is the difference between distance and displacement?

Answer 11

Distance is a scalar quantity representing the total path length, while displacement is a vector quantity representing the shortest path between two points.

Question 12

Which physical quantity is represented by the area under a velocity-time graph?

Answer 12

Displacement

Question 13

Fill in the blank: The motion of an object under the influence of gravity alone is called _____ .

Answer 13

Free fall

Question 14

What is the standard acceleration due to gravity on Earth?

Answer 14

9.81 m/s²

Question 15

Which of the following is not a vector quantity? A) Force B) Velocity C) Mass D) Displacement

Answer 15

C) Mass

Question 16

What is the term for the rate of change of momentum?

Answer 16

Force

Question 17

True or False: The total mechanical energy of an object in free fall remains constant.

Answer 17

True

Question 18

What is the formula for calculating the range of a projectile launched at an angle?

Answer 18

R = (u² sin 2θ) / g

Question 19

If a projectile is launched at an angle of 45 degrees, what is the relationship between horizontal and vertical components of its velocity?

Answer 19

They are equal.

Question 20

Fill in the blank: The time of flight for a projectile launched from the ground level is _____ .

Answer 20

2u sin θ / g

Question 21

What is the trajectory of a projectile in the absence of air resistance?

Answer 21

A parabola

Question 22

Which factor does not affect the range of a projectile? A) Launch angle B) Initial speed C) Mass of the projectile D) Height of launch

Answer 22

C) Mass of the projectile

Question 23

True or False: The horizontal motion of a projectile is independent of its vertical motion.

Answer 23

True

Question 24

What does the term ‘relative velocity’ refer to?

Answer 24

The velocity of one object as observed from another object.

Question 25

In projectile motion, what is the vertical acceleration throughout the motion?

Answer 25

9.81 m/s² downwards

Question 26

Which equation would you use to find the final velocity of an object under constant acceleration?

Answer 26

v = u + at