7.6 - equilibrium rules

Question 1

what always happens when 2 objects interact

Answer 1

they exert equal and opposite forces

Question 2

what does a free body diagram show

Answer 2

all the forces acting on the object as well as the forces the objects acts on other objects

Question 3

for objects in equilibrium, what must the 3 forces acting on it be

Answer 3

have a combined vector sum = 0

for 2 of the forces giving an equal and opposite resultant force to the 3rd

Question 4

box on a slope, force diagram

• all 3 forces
• how can you tell its in equilibrium

Answer 4

• all 3 lines of actions intercept at the same point

Question 5

what can an object be stated as when in equilibrium

Answer 5

stationary

moving at a constant velocity

Question 6

what conditions are needed for a body to be in equilibrium

Answer 6

resultant force= 0

the principle of moments apply