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Welcome to NRICH.

Physics

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Speed/distance/time problems

• 3 Average speed problem
• 3 Travel on a river problem
• 4 Strategic placing of fuel reserves
• 4 Average speed
• 4 Speed, Distance and Time
• 3 Fly flying between two cars

Mechanics

• 4 Monkey on a rope over a pulley, and a lot of relativity
• 4 Quadratic Equation Problem
• 5 Rain - Walk or Run
• 5 Constant acceleration problems
• 5 Minimum time between stations
• 5 Equation for a projectile (thrown object)
• 5 Projectile Angles
• 5 Projectile questions
• 5 Particle projection
• 5 Particle projected up a rough slope
• 5 Projectile Motion
• 5 Position vector of particle
• 5 Mechanics questions
• 5 Velocity vector
• [an error occurred while processing this directive]Moving target question
• 5 Modelling air resistance
• 5 Collision question
• 5 Work-energy questions
• 5 Kepler's Law
• 5 If Earth had Rings..
• 5 Planetary Motion
• 5 Satellite falling to Earth
• 5 Variable acceleration question
• 5 Variable Mass Problem
• 5 Boomerangs
• 5 Center of Gravity / Mass
• 5 Centre of gravity of polygon
• 5 Catenary: shape of hanging chain
• 5 Shape formed by a string lighter than air
• 5 Conical pendulum
• 5 Torsional Pendulum
• 5 Simple Harmonic Motion questions
• 5 Simple harmonic motion of two particles
• 5 Energy of vibrating string
• 5 Double Pendulum Discussion
• 5 Massive springs
• 5 Acceleration as a function of displacement
• 5 Conservation of energy questions
• 5 Where does lost kinetic energy go?
• 5 Finding a position of equilibrium by considering energy
• 5 Collision and coefficient of restitution
• 5 Acceleration depending on time
• 5 dv/dt=Gm/d²?
• 5 Turbulence
• 5 Aeroplanes flying upside-down
• 5 Stability of a moving bicycle
• 5 Is the coefficient of friction always less than 1?
• 5 Newton's 2nd Law Question
• 5 Kinematics Question
• 5 Underwater Kinematics
• 5 Newtonian Gravitation & a differential equation
• 5 Newtonian mechanics, differential equations, and the relationship between mathematics and physics
• 6 D'Alembert's Principle
• 5 Hooke's Law
• 5 Moment of Inertia of Parallelepiped
• 6 Stability of an equilibrium point

Quantum mechanics

• 5 Discussion of Quantum Mechanics
• 5 Electromagnetic repulsive force between protons
• 6 Some nuclear physics questions
• 6 Schrodinger's Wave Equation
• 6 Dipoles
• 6 Is distance quantised?
• 6 Derivation of Atomic Orbital Shapes

Relativity

• 3 E=mc²
• 4 Monkey on a rope over a pulley, and a lot of relativity
• 4 Articles: Geometry and Gravity
• 4 Article: Which Twin is Older?
• 5 Special Relativity for non-scientists
• 5 Altering perpendicular unit vectors
• 6 SR for acceleration
• 6 Derivation of E = mc²
• 6 Relativity: Twin Paradox
• 6 General Relativity
• 6 Infinity, cardinality, and some relativity
• 5 Discussion of Gravity

Black holes, etc

• 5 Article: Earth Shapes
• 6 Existence of black holes
• 6 Black Holes
• 6 Is the universe flat?
• 6 Massive Discussion of Space and Time
• 6 Infinity, cardinality, and some relativity

Miscellaneous

• 3 Mirrors
• 3 Size of mirror needed to see reflection
• 5 Bird's Path
• 5 Perturbation Theory
• 5 Motivate project:The sun
• 5 Motivate project:Chaos
• 5 Length of the Day
• 4 How is maths related to sports?
• 4 Warm water freezing faster than cold water
• 5 Mathematical Definition of Resistance
• 6 Equidistant points on sphere
• 6 Physics applications of e^ip=-1