chapt 5 (turning effects of forces)

Question 1

what are moments of a force? (1) everyday examples? (2)

Answer 1

moment of a force about a pivot is the product of a force and the perpendicular distance from the pivot to the LOA of force.

Door hinge and lifting lid of a tin using spoon.

Question 2

principal of moments? (1)

Answer 2

When body is in equilibrium, sum of CWM about a pivot is = to sum of ACWM about the same pivot.

Question 3

Centre of Gravity? (1)

Answer 3

An imaginary point where all the weight of the object is acting on.