Welcome to your Rotational Motion -5
1.
If mass of each square is equal, COM depends on
2.
COM of a triangular lamina is found by dividing it into
3.
Even if particles move randomly, COM motion depends on
4.
In explosion of a body at rest, COM after explosion
5.
If all external forces act at COM, system will undergo
6.
Acceleration of centre of mass depends on
7.
A triangular lamina is divided into many thin strips parallel to base. COM of lamina lies at
8.
Three masses 100 g, 150 g, 200 g are placed at (0,0), (0.5,0) and (0.25, 0.25√3). COM lies
9.
A bullet fired from gun causes gun to recoil. COM of gun–bullet system
10.
A system of particles is moving with constant velocity. Net external force is
11.
Internal forces in system are always
12.
COM of L-shaped lamina lies
13.
A system with many internal forces but no external force will have COM
14.
Total momentum of system equals
15.
Equation MA = Fₑₓₜ represents
16.
A shell explodes into two fragments of unequal masses. The lighter fragment moves faster because
17.
Explosion of a body affects COM motion how?
18.
In previous lamina, COM y-coordinate equals
19.
If mass of triangular lamina is doubled uniformly, its COM
20.
An L-shaped lamina is divided into three equal squares. COM is found by
21.
COM of a uniform triangular lamina lies on
22.
Before explosion, a shell is moving horizontally. After explosion, COM will move
23.
Differentiation of MR = Σmr with respect to time gives
24.
Motion of COM of rigid body depends on
25.
If Fₑₓₜ = 0, acceleration of COM is
26.
Treating a body as particle at COM is valid when studying
27.
In the above triangle, why is COM not at centroid?
28.
Acceleration of COM depends on
30.
A system of particles behaves like a single particle of mass M located at
31.
Total momentum of system equals
32.
Centre of mass of each strip in a triangular lamina lies at
33.
If masses are constant, differentiation of COM gives
34.
Velocity of centre of mass is defined as
35.
For system of particles, MR equals
36.
Vector equation for COM is written as
37.
COM of each square in L-shaped lamina is assumed at
38.
If coordinates of square centres are (½,½), (3/2,½), (½,3/2), COM x-coordinate is
39.
If no external force acts, COM
40.
Differentiating momentum equation gives
41.
An L-shaped lamina made of three identical squares has total mass 3 kg. Mass of each square is
42.
Treating a rigid body as a particle at COM is valid for
43.
COM of a body moving under gravity alone follows
44.
Projectile explodes mid-air. COM motion after explosion is
45.
A man jumps forward inside a boat floating on still water. COM of man–boat system
