UCM + WEP + COM + RM

Question 1

What is uniform circular motion

Answer 1

Moves in a circular path with constant speed

Question 2

What is centripetal acceleration

Answer 2

the change in velocity in circular motion due to the constant change in direction. It is always towards the centre of the circle

Question 3

What are examples of centripetal force

Answer 3

1. Turning of car - friction
2. Stone in circle - tension
3. Earth’s orbit of sun - gravity
4. Atom - electrostatic force

Question 4

What is the minimum velocity for vertical circular motion

Answer 4

√5gl

Question 5

What is work

Answer 5

work is said to be done when a body acted by a force actually moves some distance

Question 6

What is a conservative force

Answer 6

Force depends only on the initial and final position

Question 7

What is potential energy

Answer 7

The energy possessed by a body due to its state of strain or position

Question 8

What is a collision

Answer 8

Collision is said to occur when two bodies or particles physically strike against each other or influence the path of one another

Question 9

What is centre of mass

Answer 9

Certain point whose motion characterizes the motion of the whole system

Question 10

When is torque maximum

Answer 10

When angle = 90

Question 11

When is J(v) = 0

Answer 11

1. when linear momentum = 0
2. When mass is at origin
3. p(v) Line passes through origin

Question 12

What is an rigid body

Answer 12

A body which does not produce any displacement of particles of the body relative to each other when external force is applied

Question 13

What is moment of inertia

Answer 13

The tendency of a body to resist any change in its state of rotation about an axis

Question 14

What is the formula definition of moment of inertia

Answer 14

The moment of inertia of a rigid body about a given axis is the sum product of the mass of its particles and the square of their respective from the axis of rotation

Question 15

What is radius of gyration

Answer 15

The radial distance of a point from the axis of rotation which if the whole body’s mass was concentrated there, the moment of inertia would be the same

Question 16

What is theorem of parallel axis

Answer 16

The moment of inertia of a body about any axis is equal to its moment of inertia about its parallel axis through its centre of mass, plus the product of the mass of the body and the square of the perpendicular and the square of the perpendicular distance between the two axes

Question 17

What is perpendicular axis theorem

Answer 17

It states that the moment of inertia of an uniform body about an axis perpendicular to its plane is equal to the sun of the moment of inertia of about any two mutually perpendicular axis intersecting the first axis

Question 18

What is conservation of angular momentum

Answer 18

If no external torque is acting upon a body rotating about an axis then it’s angular momentum remains constant

Question 19

What are the conditions for equilibrium of rigid bodies

Answer 19

1. Centre of mass must move with constant velocity/ vector sim of forces must be zero
2. Net torque of forces acting on body must be zero