MEC221 - INTRODUCTION TO DYNAMICS (OCT 2025)

How confident are you in your current understanding of basic concepts in Dynamics (forces, motion, Newton’s laws, diagrams)?

• Very confident

• Somewhat confident

• So-so

• Not confident

Which branch of mechanics studies bodies at rest?

• Dynamics

• Statics

• Kinematics

• Kinetics

Dynamics is mainly concerned with:

• Equilibrium of forces

• Motion under action of forces

• Shape deformation

• Fluid flow

Kinematics studies:

• Motion without considering forces

• Motion by referring to forces

• Equilibrium conditions

• Stress-strain relationships

Kinetics refers to:

• Geometry of motion

• Equilibrium of rigid bodies

• Motion caused by forces

• Deformation

Which diagram shows external forces acting on a body?

• Kinematic diagram

• Free-body diagram

• Kinetic diagram

• Structural diagram

Newton’s 2nd Law is represented as:

• ΣF = 0

• Every action has reaction

• • Momentum is conserved

• F = ma
  

SI unit of force is:

• kg·m/s

• kg·m/s²

• N·m

• J

Which Newton’s law describes inertia?

• 1st law

• 2nd law

• 3rd law

• Zeroth Law

Why is a free-body diagram important in dynamics?

• To calculate deformation

• To identify all forces acting on the body

• To simplify units

• To measure displacement directly