Forces

Question 1

hooke’s law

Answer 1

extension or compression in a material is directly proportional to the applied force, provided that the limit of proportionality is not exceeded
(F = kx)

Question 2

definition of moment

Answer 2

moment of a force about a pivot is the product of the force and the perpendicular distance from the pivot to the line of action of the force

Question 3

definition of torque

Answer 3

the torque of a couple is the product of one of the forces and the perpendicular distance between the forces

Question 4

principle of moments

Answer 4

for a body to be in equilibrium, the sum of clockwise moments abt any pivot is equal to the sum of anti-clockwise moments abt the same pivot

Question 5

conditions for equilibrium

Answer 5

resultant force and resultant torque are both zero

Question 6

what is a couple

Answer 6

pair of forced which are equal in magnitude but opp in direction and whose lines of action do not coincide (produces rotation only)

Question 6

how to see if 3 non-parallel forces acting on an object are in equilibrium?

Answer 6

vector diag formes closed triangle

forces pass through common pt when extended