Physics 170 Worksheet 3, Extra Practice: Equilibrium & Moment of a Force
E3-0 Equilibrium in 2D. a) The masses are in equilibrium as shown. Find 𝑚𝑚𝐴𝐴 .
b) Find 𝑚𝑚𝐴𝐴 in this configuration if 𝜙𝜙 = 10𝑜𝑜 .
E3-1 Determine the magnitude and direction of the force P required to keep the concurrent
force system in equilibrium.
E3-2. a) Determine the tension developed in the cables AB and AC and the force developed along the strut
AD for equilibrium of the 400 lb crate. (3-52)
b) The tension developed in each of the cables cannot exceed 300 lbs. (3-53)
a. Determine the largest weight of crate that can be supported.
b. Determine the force developed along strut AD.
E3-3 a) Determine the tension developed in cables AB, AC and AD for equilibrium of the 75 kg load.
b) The tension developed in each of the cables cannot exceed 1 kN. Determine the largest mass of the
cylinder that can be supported.
E3-4. Determine the force in each cable needed to support the 100 lb load.
E3-5. The horizontal 30-N force acts on the handle of the wrench. Determine the moment of
this force about point O.
E3-6. Determine the moment of the force 𝐹⃗ about the point O. The force has the coordinate direction angles
α = 60o, β = 120o, γ = 45o. Express the result as a Cartesian Vector.
E3.7 a) The pipe assembly is secured on the wall by the two brackets. The flowerpot weighs 50 lb. Determine
the magnitude of the moment produced by the weight about the OA axis.
b) The frictional force of both brackets can resist a maximum moment of 150 ftlb. Determine the largest
weight of the flowerpot that can be supported.
Physics 170 Worksheet 3 (Extra Practice): Equilibrium & Moment of a Force
E3-0 Equilibrium in 2D. a) The masses are in equilibrium as shown. Find 𝑚𝑚𝐴𝐴 .
b) (Extra) Find 𝑚𝑚𝐴𝐴 in this configuration if 𝜙𝜙 = 10𝑜𝑜 .
E3-1
Ε3−2
Ε3−3
Ε3−4
Ε3−5
Ε3−6
Ε3−7
5.71
5.71
5.71
5.71