Name ____________________________________________________ Class _____________ Date _____________
Advanced Physics Chapter 9: Bodies in Equilibrium
Read section 9.1—9.3 and then address the following questions.
1) What is Statics?
2) What is equilibrium?
3) What is the first condition for equilibrium?
4) What is the second condition for equilibrium?
5) List the five steps for solving Statics problems.
6) There are five types of statics problems you will be responsible for knowing how to solve;
they are as follows:
 Object supported by two cords
 Lever
 Seesaw
 Beam with supports
 Beam and wire
7) Solve the following problems:
a) Object supported by two cords: Two ropes support a 50-kg sign, one at a 55 angle
from vertical and the other at a 25 angle from vertical. Find the tension in each rope
Name ____________________________________________________ Class _____________ Date _____________
b) Lever: Calculate the amount of force that must be applied to a lever to balance a 250-kg
rock that is 0.5m from the fulcrum (right) if the force is applied 1.7m from the fulcrum
(left).
c) Seesaw: Calculate the distance from the fulcrum (left) that a 65-kg child must be to
balance two children; one who is 15-kg and 0.5 m from fulcrum (right) and the other who
is 75-kg and 1.2 m from fulcrum (right).
d) Beam with supports: Find the force exerted on two supports that are 2m apart when a
65-kg child stands on a board (of negligible mass) at 0.4 m from one end.
e) Beam and wire: A 1.5m beam of mass 10-kg has a 25-kg lamp attached to one end and
is hinged to a wall on the other end. A wire is used to hold the lamp and is attached to the
end of the beam at a 48 angle with the wall. Find the forces that act on the hinge and the
tension in the wire.