Welcome to your Rotational Motion -5
1.
Total momentum of system equals
2.
If mass of each square is equal, COM depends on
3.
COM of a triangular lamina is found by dividing it into
4.
COM of a uniform triangular lamina lies on
5.
An L-shaped lamina is divided into three equal squares. COM is found by
6.
Differentiation of MR = Σmr with respect to time gives
7.
A bullet fired from gun causes gun to recoil. COM of gun–bullet system
8.
Before explosion, a shell is moving horizontally. After explosion, COM will move
9.
If masses are constant, differentiation of COM gives
10.
Vector equation for COM is written as
11.
Differentiating momentum equation gives
12.
If no external force acts, COM
13.
COM of L-shaped lamina lies
14.
Treating a body as particle at COM is valid when studying
15.
A man jumps forward inside a boat floating on still water. COM of man–boat system
16.
In previous lamina, COM y-coordinate equals
17.
Three masses 100 g, 150 g, 200 g are placed at (0,0), (0.5,0) and (0.25, 0.25√3). COM lies
18.
Projectile explodes mid-air. COM motion after explosion is
19.
Treating a rigid body as a particle at COM is valid for
20.
For system of particles, MR equals
22.
COM of each square in L-shaped lamina is assumed at
23.
Acceleration of centre of mass depends on
24.
Centre of mass of each strip in a triangular lamina lies at
25.
Equation MA = Fₑₓₜ represents
26.
Even if particles move randomly, COM motion depends on
27.
If coordinates of square centres are (½,½), (3/2,½), (½,3/2), COM x-coordinate is
28.
Motion of COM of rigid body depends on
29.
COM of a body moving under gravity alone follows
30.
Internal forces in system are always
31.
Total momentum of system equals
32.
If mass of triangular lamina is doubled uniformly, its COM
33.
An L-shaped lamina made of three identical squares has total mass 3 kg. Mass of each square is
34.
Velocity of centre of mass is defined as
35.
If all external forces act at COM, system will undergo
36.
If Fₑₓₜ = 0, acceleration of COM is
37.
In the above triangle, why is COM not at centroid?
38.
A system with many internal forces but no external force will have COM
39.
A triangular lamina is divided into many thin strips parallel to base. COM of lamina lies at
40.
Explosion of a body affects COM motion how?
41.
A system of particles behaves like a single particle of mass M located at
42.
Acceleration of COM depends on
43.
In explosion of a body at rest, COM after explosion
44.
A shell explodes into two fragments of unequal masses. The lighter fragment moves faster because
45.
A system of particles is moving with constant velocity. Net external force is
