Category
Physics
Classroom and homework physics from kinematics and Newton's laws to electricity, optics, and fluid mechanics.
Solve kinematics, force, energy, electricity, wave, optics, and fluid mechanics problems with SI-friendly inputs and instant results. From F = ma and Ohm's law to projectile motion and buoyancy — useful for homework checks and quick lab estimates.
35 tools · Private · Browser-only
Featured calculators
Popular starting points for physics homework and quick checks.
Velocity Calculator
Find velocity from displacement and time.
OpenForce Calculator
Compute force with F = ma.
OpenKinetic Energy Calculator
Energy of motion: KE = ½mv².
OpenOhm's Law Calculator
Relate voltage, current, and resistance.
OpenProjectile Motion Calculator
Range, height, and flight time for projectiles.
OpenDensity Calculator
Mass per unit volume ρ = m/V.
OpenRecently added & popular
Guides & comparisons
Understanding Ohm's Law: Voltage, Current, and Resistance
Voltage drives current through resistance in a simple linear relationship. This guide covers V = IR, unit conversions, and basic circuit analysis.
Projectile Motion Basics for Physics Homework
Projectiles follow parabolic paths when air resistance is ignored. Decompose motion into horizontal and vertical parts to solve homework problems.
Force vs Weight: What's the Difference in Physics?
Weight is a specific force — gravity on mass. Force is broader. Learn why kg is not a force and why astronauts are weightless but not massless.
Velocity vs Speed: Scalar vs Vector in Motion
Speed is how fast; velocity includes direction. Learn why average speed ≠ magnitude of average velocity on curved paths.
Motion
Velocity Calculator
Find velocity from displacement and time.
OpenSpeed Calculator
Find speed from distance and time.
OpenAverage Speed Calculator
Mean speed over multiple segments.
OpenAcceleration Calculator
Rate of change of velocity over time.
OpenDistance Calculator
Distance from speed and time or SUVAT.
OpenTime Calculator
Time from distance and speed or acceleration.
OpenFree Fall Calculator
Motion under gravity near Earth's surface.
OpenProjectile Motion Calculator
Range, height, and flight time for projectiles.
OpenForce
Energy
Kinetic Energy Calculator
Energy of motion: KE = ½mv².
OpenPotential Energy Calculator
Gravitational PE = mgh.
OpenWork Calculator
Mechanical work W = Fd cos θ.
OpenPower Calculator
Power as work or energy per time.
OpenMechanical Energy Calculator
Total KE + PE in conservative systems.
OpenEfficiency Calculator
Output vs. input energy or power.
OpenElectricity
Ohm's Law Calculator
Relate voltage, current, and resistance.
OpenVoltage Calculator
Find voltage from current and resistance.
OpenCurrent Calculator
Find current from voltage and resistance.
OpenResistance Calculator
Resistance from V/I or resistivity.
OpenElectrical Power Calculator
Power in circuits: P = VI = I²R.
OpenCapacitance Calculator
Charge storage Q = CV and parallel-plate C.
OpenWaves
Optics
Fluids
Frequently asked questions
- What unit system do these physics tools use?
- SI units by default (meters, kilograms, seconds, newtons, joules). Field labels note the expected unit.
- Can I check homework answers?
- Yes — enter your problem values and compare with your manual solution. Results include the formula used.
- Where should I start?
- Kinematics problems often begin with velocity or acceleration calculators; electricity problems with Ohm's law.