Science (changes in the motion of objects)

• Motion dynamics


  The study of forces that cause an object or system to move
• Inertia


  The property of an object to resist changes in its state of motion
• Motion is described in terms of distance, displacement, velocity, and acceleration
• An object changes its position over time
• When a bus suddenly stops

  The man standing still moves forward due to inertia
• Force


  The push and pull of an object with a specific magnitude and direction
• The first law of motion (law of inertia)

  A body at rest remains at rest, and a body in motion remains in motion at a constant velocity, unless acted upon by an external force
• Inertia


  • More massive objects have more inertia, making it more difficult to change their state of motion
• An index card can be quickly removed from a glass with a penny on top, demonstrating the law of inertia
• When steering a liquid, the swirling motion continues due to inertia