EDP2 - Unit 2 Review - Forces and Trusses

Determine the reaction forces at member A.

(Negatives mean left/down and positives mean up/right)

• Ax = 120 kN

  Ay = 195 kN

• Ax = 195 kN

  Ay = 120 kN

• Ax = -120 kN

  Ay = -195 kN

• Ax = -195 kN

  Ay = -120 kN

Determine the reaction forces at support D.

• 120 kN down

• 120 kN up

• 120 kN left

• 120 kN right

What is the force in member AB?

• 195 kN (C)

• 195 kN (T)

• 120 kN (C)

• 120 kN (T)

What is the force in member AB?

• 195 kN (C)

• 195 kN (T)

• 120 kN (C)

• 120 kN (T)

What is the force in member BD?

• 169.71 kN (C)

• 169.71 kN (T)

• 143.26 kN (C)

• 143.26 kN (T)

TRUE OR FALSE:

Roller joints have two reaction forces.

• True

• False

TRUE OR FALSE:

Pinned joints have two reaction forces.

• True

• False

TRUE OR FALSE:

A moment is equal to the force times the parallel distance from the pivot point to where that force is acting.

• True

• False

A person is pushed forward into their seatbelt when a car stops. Which of Newton's laws explains this motion?

• 1st law

• 2nd law

• 4th law

• 3rd law

A 100-ft long steel wire has a cross-sectional area of 0.0144 in.². When a force of 270 lb is applied to the wire, its length increases by 0.75 in. Determine the Modulus of Elasticity.

• 3 x 10⁷ psi

• 18,750 psi

• 2.5 x 10⁶ psi

• 16,750 psi