(2000lbm × 2ft sec2) ÷ 32.17
Application of Newton's Laws
Force Equilibrium Summary
The force that is the resultant force of all forces acting on a body is defined as
the net force.
If the vector sum of all the forces acting on an object is equal to zero, then the
object is in equilibrium.
The first condition of equilibrium is stated as follows: "A body will be in
translational equilibrium if and only if the vector sum of forces exerted on a
body by the environment equals zero."
F + F + F = 0
F = 0
Any force or system of forces capable of balancing a system so that the net
force is zero is defined as an equilibrant.
Since the car remains on the surface, forces N and W are in equal and
opposite directions. Force F must be applied in an equal and opposite
direction to F in order for the forces to be in equilibrium.
The concepts presented in this chapter are summarized below.