Mechanics: Kinematics and Dynamics

What is the primary focus of kinematics in the study of motion?

Which of the following equations of motion is used to calculate the velocity of an object?

What is the physical quantity that is defined as the rate of change of velocity?

What is the name of the law that states that every action has an equal and opposite reaction?

What is the type of force that opposes motion between two surfaces in contact?

What is the equation that relates the work done on an object to its change in kinetic energy?

What is the unit of measurement for forces?

Which type of force is responsible for attracting two objects with mass towards each other?

What is the term for the shortest distance between the initial and final positions of an object?

Which of Newton's laws states that an object at rest will remain at rest, and an object in motion will continue to move with a constant velocity, unless acted upon by an external force?

What is the term for the rate of change of distance with respect to time?

Which type of motion involves motion in a circular path?

Mechanics

Kinematics

Study of motion without considering forces
Describes the position, velocity, and acceleration of objects
Key concepts:
- Displacement (Δx): change in position
- Velocity (v): rate of change of displacement
- Acceleration (a): rate of change of velocity
- Time (t): measure of duration
- Equations of motion:
  - v = Δx / t
  - a = Δv / t
  - v = u + at
  - s = ut + 0.5at^2

Dynamics

Study of motion considering forces
Describes the relationship between forces and motion
Key concepts:
- Force (F): push or pull that causes motion
- Newton's Laws of Motion:
  - First Law (Inertia): objects at rest stay at rest, objects in motion stay in motion
  - Second Law (F = ma): force equals mass times acceleration
  - Third Law (Action-Reaction): every action has an equal and opposite reaction
- Types of forces:
  - Gravity (Fg): attractive force between objects
  - Friction (Ff): resistive force opposing motion
  - Normal force (Fn): force exerted by a surface
  - Tension (T): force exerted by a stretched string

Energy and Work

Energy: ability to do work
Work (W): transfer of energy from one object to another
Types of energy:
- Kinetic energy (K): energy of motion
- Potential energy (U): energy of position or configuration
- Total mechanical energy (E): sum of kinetic and potential energy
Work-energy theorem: W = ΔK = (mgh)

Test your knowledge of mechanics, including kinematics, dynamics, energy, and work. Learn about displacement, velocity, acceleration, forces, and Newton's Laws of Motion.