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XI_Physics New Chap 3 Motion in a Plan Impactful_Statements
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XI_Physics New Chap 3 Motion in a Plan Impactful_Statements
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XI Physics_New Chapter-4_Laws of Motion [True or False Statement Questions]Sl # Statement [3.7 MOTION IN A PLANE] True/False
1 An object can have a zero acceleration even when its velocity is non-zero. TRUE
2 Displacement is the change in the position vector of an object. TRUE
For motion in two dimensions, the velocity and acceleration vectors of an object are always
3 FALSE
along the same straight line.
In motion in a plane, the velocity and acceleration vectors can change their direction
4 TRUE
independently of each other.
5 In one dimension, velocity and acceleration are always along the same straight line. TRUE
In two dimensions, velocity and acceleration vectors may have any angle between 0° and
6 TRUE
180° between them.
Instantaneous acceleration is obtained by taking the limit of average acceleration as the time
7 TRUE
interval approaches zero.
8 The acceleration of an object can change even when its velocity remains constant. TRUE
9 The acceleration of an object is the derivative of its position vector with respect to time. FALSE
The acceleration vector of a particle moving in the x-y plane is given by a = d^2x/dt^2 i +
10 TRUE
d^2y/dt^2 j.
11 The angle between velocity and acceleration vectors can be greater than 90 degrees. TRUE
The average acceleration of a particle is the change in displacement divided by the time
12 FALSE
interval.
The average acceleration of an object for a time interval ∆t is given by a = (∆vx/∆t) i + (∆vy/∆t)
13 TRUE
j.
The average velocity and the instantaneous velocity of an object are the same when the time
14 TRUE
interval is very small.
15 The direction of average acceleration is the same as that of the change in velocity. TRUE
The direction of the acceleration vector a of a particle is always perpendicular to the plane of
16
motion. FALSE
The direction of the instantaneous acceleration vector a is tangential to the path of motion
17 TRUE
and in the direction of motion.
The direction of the resultant vector R in two-dimensional motion is given by sin(a) = B
18
sin(q)/A using the Law of sines. FALSE
The direction of the resultant vector R obtained by the parallelogram method depends on the
19 TRUE
angle between vectors A and B.
The direction of the velocity vector v at a given time t is given by θ = tan^(-1)(vy/vx) with
20 FALSE
respect to the x-axis.
21 The direction of velocity at any point on a path is tangential to the path at that point. TRUE
The direction of velocity at any point on the path of an object is always perpendicular to the
22 FALSE
path at that point.
The instantaneous acceleration of an object is the limiting value of the average acceleration
23 TRUE
as ∆t approaches zero.
The instantaneous velocity of a particle is the limiting value of the average velocity as the
24 TRUE
time interval approaches zero.
The Law of cosines gives the magnitude of the resultant vector R, and the Law of sines gives
25 TRUE
its direction.
The magnitude of the average velocity of an object is always greater than or equal to its
26 FALSE
instantaneous velocity.
The magnitude of the displacement of an object is always equal to the magnitude of its
27 FALSE
average velocity.
The magnitude of the instantaneous acceleration vector a is always equal to the magnitude of
28
the velocity vector v. FALSE
The magnitude of the resultant vector R in the parallelogram method is given by R = √(A^2 +
29 TRUE
B^2 + 2ABcos(q)).
1 OF 6 RI_Best Wishes
, XI Physics_New Chapter-4_Laws of Motion [True or False Statement Questions]
Sl # Statement [3.7 MOTION IN A PLANE] True/False
The magnitude of the resultant vector R in two-dimensional motion is given by R^2 = A^2 +
30 TRUE
B^2 + 2AB cos(q) using the Law of cosines.
31 The magnitude of the velocity vector is always positive. FALSE
32 The magnitude of the velocity vector v at a given time t is given by |v| = √(vx^2 + vy^2). TRUE
33 The position vector of a particle in a plane is given by r = xi + yj. TRUE
The position vector r of a particle in motion in a plane is given by r = xi + yj, where x and y are
34
time-dependent functions. FALSE
35 The resultant vector of two vectors A and B making an angle q is given by R = A + B. TRUE
The resultant vector R in two-dimensional motion is given by R = A + B using the
36 TRUE
parallelogram method of vector addition.
The velocity vector of a particle moving in the x-y plane is given by v = dx/dt i + dy/dt j, where
37 TRUE
x and y are components of the position vector.
38 Velocity and acceleration vectors in two dimensions can have any angle between them. TRUE
2 OF 6 RI_Best Wishes
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