FAQs on Motion in a Straight Line in One Shot (NCERT)

Question 1

1. What's the difference between speed and velocity in motion problems?

Accepted Answer

Ans. Speed measures how fast an object moves regardless of direction, while velocity specifies both speed and direction. For NEET Physics, this distinction matters because velocity is a vector quantity essential for solving one-dimensional motion equations, whereas speed is scalar and doesn't account for displacement direction.

Question 2

2. How do I solve problems using the kinematic equations for uniformly accelerated motion?

Accepted Answer

Ans. Kinematic equations relate displacement, velocity, acceleration, and time in straight-line motion. The three main equations-v = u + at, s = ut + ½at², and v² = u² + 2as-connect initial velocity (u), final velocity (v), acceleration (a), and displacement (s). Identify known variables, select the appropriate equation, and substitute values to find unknowns in motion analysis.

Question 3

3. Why do graphs of position-time and velocity-time look different for the same motion?

Accepted Answer

Ans. Position-time graphs show how displacement changes; their slope represents velocity. Velocity-time graphs display velocity changes; their slope indicates acceleration. In uniformly accelerated motion along a straight line, position-time curves are parabolic while velocity-time graphs are linear, reflecting different physical relationships between these quantities in kinematics.

Question 4

4. What exactly counts as relative velocity and when do I need it in exam questions?

Accepted Answer

Ans. Relative velocity measures motion of one object with respect to another, calculated by subtracting velocities: v_AB = v_A - v_B. In one-dimensional motion problems, especially involving two objects moving in the same or opposite directions, relative velocity determines when they meet, separate, or maintain constant distance-critical for collision and chase-type NEET questions.

Question 5

5. Can an object have zero velocity but non-zero acceleration at the same instant?

Accepted Answer

Ans. Yes, this occurs at the highest point of vertical motion or when an object momentarily stops before reversing direction. An object thrown upward has zero velocity at maximum height yet experiences constant gravitational acceleration downward. This concept clarifies why acceleration and velocity are independent quantities in straight-line motion analysis for exam preparation.

00:00	Introduction
00:45	Motion.
02:26	Rectilinear
05:08	Scalar & vector
07:55	Path Length Vs Displacement
13:01	Speed Vs.Velocity
16:43	Distance - Time:Graph
28:43	Position -Time:Graph
37:49	Can Slope be negative
40:28	Position Time Graphs:Examples
45:06	Average & instantaneous Speed
51:26	Average & Instantaneous Velocity
52:16	Acceleration
54:00	Acceleration :V-T graph
62:10	When Accleration =0
62:59	Average & Instantaneous Acceleration
63:30	Velocity Time Graphs:Examples
70:52	Acceleration -Time Graph
77:34	Area under Velocity Time Graph=Displacement
80:06	Important Points:Position & Velocity Graphs
81:36	Example 1
85:46	Example 2
87:38	Kinematic Equations
90:27	Problem 1
98:14	Problem 2
102:35	Relative Velocity
104:51	Relative Velocity:Basics
110:28	Relative Velocity:Special Case
113:00	Relative Velocity:Problem
More

00:00	Introduction
00:45	Motion.
02:26	Rectilinear
05:08	Scalar & vector
07:55	Path Length Vs Displacement
13:01	Speed Vs.Velocity
16:43	Distance - Time:Graph
28:43	Position -Time:Graph
37:49	Can Slope be negative
40:28	Position Time Graphs:Examples
45:06	Average & instantaneous Speed
51:26	Average & Instantaneous Velocity
52:16	Acceleration
54:00	Acceleration :V-T graph
62:10	When Accleration =0
62:59	Average & Instantaneous Acceleration
63:30	Velocity Time Graphs:Examples
70:52	Acceleration -Time Graph
77:34	Area under Velocity Time Graph=Displacement
80:06	Important Points:Position & Velocity Graphs
81:36	Example 1
85:46	Example 2
87:38	Kinematic Equations
90:27	Problem 1
98:14	Problem 2
102:35	Relative Velocity
104:51	Relative Velocity:Basics
110:28	Relative Velocity:Special Case
113:00	Relative Velocity:Problem
More

Motion in a Straight Line in One Shot (NCERT) Video Lecture - Physics Class

Physics Class 11

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