1.3)Moments

Question 1

Define moments

Answer 1

Turning effect of the force

Question 2

Moment=

Answer 2

Moment = force x perpendicular distance to the pivot

Question 3

State two conditions which must be true for an object to be in equilibrium

Answer 3

1. No net force
2. No net moment

Question 5

Centre of gravity

Answer 5

It is the point where the whole weight of the body appears to act

Question 6

Centre of gravity of irregular laminar object

Answer 6

1.Hang card board from a position
2.Hang plumb line from the same line from the same point and wait until it balances and draw a line parallel to the string of plump line
3.Repeat by hanging cardboard from different positions
4.Intesection of these lines gives centre of gravity

Question 7

Kinds of equilibrium

Answer 7

1.Stable equilibrium: when body returns to its original position after its given a small force
2.Unstable equilibrium: when body topples if its given a small force
3.Neutral equilibrium: when the object takes a newer state of equilibrium when its giving a small force (sphere)

Question 8

Toppling

Answer 8

1.If the pushing force is removed while the centre of gravity is vertically above the base, the object will return to its original position
2.If the pushing force is removed while centre of mass is vertically out of the base, object will topple

Question 9

How to improve the stability of an object

Answer 9

1.Wider base
2.Lower centre of gravity