6.2 Balanced Forces

Question 1

When two forces act on a point object, the object is in equilibrium only if…

Answer 1

… the two forces are equal and opposite to each other. The resultant of the two forces is therefore zero and so are balanced

Question 2

For an object on a surface

Answer 2

S=W
In which:
S is a support force from the surface acting upwards
W is the weight of the object acting downwards

Question 3

When three forces act on a point object, their resultant is zero only if…

Answer 3

… the resultant of any two of the forces is equal and opposite to the third force

Question 4

to check the combined effect of the three forces is zero

Answer 4

Resolve each force along the same parallel and perpendicular lines
Balance the components along each line

Question 5

Testing three forces in equilibrium

Answer 5

Use pulleys and strings supporting weights from one clamp stand to another