Topic 1 - Turning Effects and Centre of Gravity (Paper 2)

Question 1

what is the formula for a moment?

Answer 1

moment = force x perpendicular distance between line of action and pivot

Question 2

how would you get the maximum moment?

Answer 2

push at right angles to the object

Question 3

what is the centre of gravity?

Answer 3

the point through which the weight of a body acts

Question 4

how would you find the centre of gravity of any flat shape?

Answer 4

1. suspend the shape and a plumb line from the same point and wait until they stop moving
2. draw a line along the plumb line
3. do the same thing again but from a different pivot point
4. centre of gravity is where the two lines cross