Fundamentals of Engineering Statics and Dynamics 2

Question 1

A 1,000 kg car accelerates from 0 to 20 m/s in 10 seconds. What is the net force acting on the car?

Accepted Answer

2,000 N

Answer

Acceleration a = Δv/Δt = 20/10 = 2 m/s². Net force F = ma = 1,000 × 2 = 2,000 N.

Question 2

What is the coefficient of static friction if a 100 N horizontal force just barely moves a 200 N block on a flat surface?

Accepted Answer

0.5

Answer

At the point of impending motion, F = μₛN, so μₛ = F/N = 100/200 = 0.5.

Question 3

In truss analysis, which method involves cutting through the truss and applying equilibrium to a free body diagram of one part?

Accepted Answer

Method of sections

Answer

The method of sections cuts the truss into two parts to find member forces directly using equilibrium equations.

Question 4

What is the work-energy theorem in dynamics?

Accepted Answer

The net work done on a body equals the change in its kinetic energy

Answer

The work-energy theorem states W_net = ΔKE = ½mv₂² - ½mv₁², relating net work to kinetic energy change.

Question 5

What type of force acts along a two-force member in a truss?

Accepted Answer

Pure axial (tension or compression) force only

Answer

A two-force member has forces applied only at two points, resulting in pure axial load with no shear or bending.

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