Statics and Dynamics Flashcards
6 cards from real Fundamentals of Engineering practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Statics and Dynamics flashcards as text
A 1,000 kg car accelerates from 0 to 20 m/s in 10 seconds. What is the net force acting on the car?
Answer: 2,000 N
Acceleration a = Δv/Δt = 20/10 = 2 m/s². Net force F = ma = 1,000 × 2 = 2,000 N.
What is the coefficient of static friction if a 100 N horizontal force just barely moves a 200 N block on a flat surface?
Answer: 0.5
At the point of impending motion, F = μₛN, so μₛ = F/N = 100/200 = 0.5.
In truss analysis, which method involves cutting through the truss and applying equilibrium to a free body diagram of one part?
Answer: Method of sections
The method of sections cuts the truss into two parts to find member forces directly using equilibrium equations.
What is the work-energy theorem in dynamics?
Answer: The net work done on a body equals the change in its kinetic energy
The work-energy theorem states W_net = ΔKE = ½mv₂² - ½mv₁², relating net work to kinetic energy change.
What type of force acts along a two-force member in a truss?
Answer: Pure axial (tension or compression) force only
A two-force member has forces applied only at two points, resulting in pure axial load with no shear or bending.
A wheel rolls without slipping. If the center moves at velocity v, what is the velocity of the contact point?
Answer: Zero
For rolling without slipping, the instantaneous velocity at the contact point is zero (instantaneous center of rotation).