Introductory Physics Homework Help Forum

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Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Why Does a Wheel Move and How Does Torque Influence Its Dynamics?
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Potential on each of these concentric spherical shells
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What is the Conservation of Energy in Spring Work at an Angle?
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Trying to understand why I got this problem wrong
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Can You Help Solve This Generalized Work Problem with an Illustrative Image?
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Excel Worksheet problems -- Piston and connecting rod connected to a crankshaft
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Vertical spring connected between two bodies with a rope above them
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Confused about calculating the average energy from a distribution graph
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Troubleshooting Interplanetary Cruise Calculations
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Accelerating pulleys (3 pulleys and 3 masses)
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Calculating work on an inclined plane
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Calculating the Force of a Jump on the Moon
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Another Doubt From Halliday Resnick Krane -- Puck on a string in circular motion
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Friction force on each foot and on each hand of a person
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Is the Angular Velocity of Pinned Rods Calculated Correctly?
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Charge density seen from a moving reference frame S' (SR + EM)
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Determining displacement and acceleration: A physics problem
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Potential energy, Wave function, Quantum physics
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Determine the final train speed (mass and slinky on a train)
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Simple conceptual question about Ohm's law
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Conservation of linear momentum, undergrad particle dynamics
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A fun, engaging and visual way of showing laminar flow for young kids
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Finding Friction Force & Work with No Applied Force
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Relativity and Simultaneity: A Cosmic Perspective
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What Is the Rate of Change of Acceleration at t=2?
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Uncertainty of pendulum period and pendulum length
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Calculating the center of mass as an astronaut moves on a shuttle
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How Do You Find the Period of a Pendulum with a Length of 35 cm?
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Triangle problem from Feynman's exercises
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Calculate the net energy of this system (mass and Slinky in an elevator)
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Evaluate reflectance of an aluminum mirror
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About Work done when velocity is constant
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Net efficiency of a cascaded Carnot Engine and Fridge
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Trajectory of an electron traveling near a current-carrying wire
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Concept not understood -- Car tires pushing the car forward....
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About KE and PE of a stone falling down a tube filled with oil
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Angular kinematic problem -- An accelerating merry-go-round
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SHM Find amplitude from ω and x
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Calculating a star's density profile
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Averaging the cube of semimajor axis to position ratio wrt to time
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To find the modulus of elasticity of a light elastic string
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How Does Mathematical Theory Explain Multiple Wave Reflections?
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Dsa -- Two masses orbiting their barycenter
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Finding the position of a middle charge to have Zero Net Force
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Need help with this unequal length bifilar pendulum
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Solving for Energy & Momentum in Physics Questions
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Mass and spring on an inclined plane
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Calculate the angular velocity for each case
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Force between charged Ring and Rod, disproved Newtons 3rd law?
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Homework help : What object rotates at 90 RPM?
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Solving Equilibrium w/ Plank & Forces | Physics Problem
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Effect of Surface Area on the Drag Coefficient of a Parachute
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Satellite orbiting the Earth (heat radiation)
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Substended angle, rotational kinematics
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How Is the Semimajor Axis Calculated for a Distant Planet's Orbit?
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Understanding Spark Production in Dissectable Glass Capacitors
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Boundary conditions for 2 ropes fixed to a massless ring with a damper
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Moment of Inertia of a 4 rod system
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Boats in a triangle colliding after some time
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Can Temperature Alone Affect the Volume of Air in a Room?
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Solving a Rod-Particle System: Troubles with Forces
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Understanding the electric force felt by the charges on a sphere
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Limiting radius ratio for tetrahedral
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What Causes Angular Acceleration and Torque in a Free Body Diagram?
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How to interpret a passage in Purcell's Electricity and Magnetism
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Effect on net torque and net force on spools
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The angular acceleration and period of a pulsar
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How Do Electromagnets Repel Each Other in a Zero-Resistance Environment?
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What is the meaning of work done for non-uniform circular motion?
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Solving a Problem: Forces Acting on P
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Comparing Energy and Movement on a Swing and Water Slide
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Confusion with force components
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Tension and Angle Analysis for Traction in a Broken Leg
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Magnitude and average value of energy intensity of light beam
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About work done through exercise (push ups)
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How Do Support Reactions Affect 2D Static Equilibrium in a Shopping Cart?
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Momentum of Cube: Magnitude and In-Between Speed
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What is the maximum spring displacement?
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Kinematics and One Dimensional Motion
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Total KE = Sum of Translational & Rotational KE: Proving the Equation
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On which objects can we apply Gauss' Law to find the electric field?
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How Does Increasing Resistance Affect Current Flow in a Circuit?
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About Kinetic Energy of a ball falling vertically and bouncing up
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Find the maximum KE of a charged Disc
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Electric field is constant around charged infinite plane. Why?
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Shooting an arrow through the spokes of a turning wheel
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Diving airplane as a projectile
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Flat Belt and Pullies with different Coefficients
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Two Mass Three Rope Tension Problem
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How do I accurately calculate optical cycles in a femtosecond laser pulse?
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When it states "in terms of a, b, c" do you need to use all variables?
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Relative Motion problem involving a moving person and a moving bus
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What is the relationship between particles and waves in QED?
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Velocity vector addition problem
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Bernoulli’s Equation and External Forces
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Complex collision with masses and Velcro
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Linear speed of sphere as it passes through lowest point
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About steel balls of different masses and net force
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Angular velocity of rod and bug
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Help with 2D mass-spring-damper system
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