State the two conditions that must be met for an object to be in complete equilibrium.

A book with a weight of 10 N is at rest on a table. What is the magnitude and direction of the normal reaction force from the table on the book?

For an object to be in equilibrium under the action of two forces, what three conditions must the forces satisfy?

What does the term "coplanar forces" mean?

A traffic light weighing 100 N hangs from two cables. What is the total upward force provided by the two cables for the light to be in equilibrium?

If three non-parallel forces act on an object to keep it in equilibrium, what must be true about their lines of action?

Define the "center of gravity" of an object.

A uniform plank is supported at its two ends. Where does the weight of the plank itself act from?

If an object is moving at a constant velocity, is it in equilibrium? Explain.

Why does a wide base make an object more stable?

If three parallel forces are in equilibrium, what is the relationship between the force acting in one direction and the forces acting in the opposite direction?

A picture frame hangs from a single nail. Name the three forces acting on it that keep it in equilibrium.

Is it possible for an object to be in equilibrium if four forces are acting on it?

For an object to be in rotational equilibrium, what must be true about the moments acting on it?

A uniform 2 m long plank has a weight of 50 N. If it is supported exactly at its center, what force must be applied 0.5 m from the center to keep it balanced?