6.2 Balanced forces

Question 1

when is an object in equilibrium

Answer 1

when the two forces acting on an object are equal and opposite and therefore the resultant force is 0

they are said to be balanced

Question 2

what must happen for the resultant force to be zero if 3 forces are acting on an object

Answer 2

if the resultant force of any 2 of the forces is equal and opposite to the third force

Question 3

how to check the combined effect of 3 forces is 0

Answer 3

resolve each force along the same parallel or perpendicular lines

balance the components along each line

Question 4

what does friction on the slope equal

Answer 4

f = w sin theta

Question 5

what does the support force on a slope equal (vertical)

Answer 5

s= w cos theta

Question 6

how to find tension in string

Answer 6

t cos theta 1 + t cos theta 2 = W