Physics in Plain Sight

Gravity pulls every mass toward every other mass, a relationship Newton captured in his law of universal gravitation.

Friction opposes motion between surfaces in contact, and rubbing hands together turns that resistance into warmth.

Inertia is the resistance to a change in motion described by Newton's first law.

Momentum measures an object's motion as the product of its mass and velocity.

Newton's third law says every action produces an equal and opposite reaction, as when a swimmer pushes water back to move ahead.

Buoyancy is the upward force fluids exert on submerged objects, first explained by Archimedes.

The Doppler effect shifts a wave's pitch with relative motion and helps astronomers measure how fast stars move.

Centripetal force keeps a moving object on a curved path by constantly pulling it toward the center.

Bernoulli's principle links a fluid's speed to its pressure, helping explain how airflow generates lift on a wing.

A lever multiplies force around a pivot point, the principle at work in a balanced seesaw.

A pulley redirects a pulling force, letting a rope raise a flag by pulling down instead of up.

Terminal velocity is reached when air resistance grows strong enough to balance the pull of gravity on a falling object.

Refraction bends light as it changes speed moving between materials, making a straw look bent in water.

Reflection returns light at the same angle it strikes a surface, which is how mirrors show a clear image.

Diffraction spreads waves around obstacles or through narrow gaps, most visibly when the gap nears the wave's own length.

Sound travels as vibrations through a medium and moves faster through water than through air.

Thermal expansion makes most materials grow slightly as they heat, loosening a stuck lid under hot water.

Convection carries heat through circulating fluid or gas, sending warm air rising above a radiator.

Conduction passes heat directly between touching materials, heating a metal spoon left in hot soup.

Thermal radiation carries heat as electromagnetic waves, letting a campfire warm you without direct contact.

The photoelectric effect releases electrons when light hits a material, and Einstein's explanation of it won a Nobel Prize.

Magnetism arises from moving electric charge and aligns a compass needle toward magnetic north.

Static electricity builds from an imbalance of charge on a surface, letting a rubbed balloon cling to a wall.

Resonance amplifies vibration when an outside frequency matches an object's own natural rate, sometimes shattering glass.

Surface tension pulls a liquid's surface tight enough to let some insects walk across water.

Electromagnetic induction, discovered by Michael Faraday, generates current from a changing magnetic field, as in a bicycle dynamo.

Diffusion spreads particles from areas of high to low concentration, coloring a whole glass of water from one drop.