7.6 - equilibrium rules Flashcards
1
Q
what always happens when 2 objects interact
A
they exert equal and opposite forces
2
Q
what does a free body diagram show
A
all the forces acting on the object as well as the forces the objects acts on other objects
3
Q
for objects in equilibrium, what must the 3 forces acting on it be
A
have a combined vector sum = 0
for 2 of the forces giving an equal and opposite resultant force to the 3rd
4
Q
box on a slope, force diagram
- all 3 forces
- how can you tell its in equilibrium
A
- all 3 lines of actions intercept at the same point
5
Q
what can an object be stated as when in equilibrium
A
stationary
moving at a constant velocity
6
Q
what conditions are needed for a body to be in equilibrium
A
resultant force= 0
the principle of moments apply
