6.2 Balanced forces Flashcards
1
Q
when is an object in equilibrium
A
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
2
Q
what must happen for the resultant force to be zero if 3 forces are acting on an object
A
if the resultant force of any 2 of the forces is equal and opposite to the third force
3
Q
how to check the combined effect of 3 forces is 0
A
resolve each force along the same parallel or perpendicular lines
balance the components along each line
4
Q
what does friction on the slope equal
A
f = w sin theta
5
Q
what does the support force on a slope equal (vertical)
A
s= w cos theta
6
Q
how to find tension in string
A
t cos theta 1 + t cos theta 2 = W
