Kinematics, forces, vectors, motion, momentum, energy and the dynamics of objects

ASTM Grades Steel Bolts

ASTM steel bolts - proof and tensile strength

Acceleration Units Converter

Convert between common units of accelerations

Acceleration of Gravity and Newton's Second Law

Acceleration of gravity and Newton's Second Law - SI and Imperial units

American Standard Beams - S Beam

American Standard Beams ASTM A6 - Imperial units

American Wide Flange Beams

American Wide Flange Beams ASTM A6 in metric units

American Wide Flange Beams - W Beam

American Wide Flange Beams ASTM A6 in English units

Area Moment of Inertia

Area Moment of Inertia, Moment of Inertia of an Area or Second Moment of Area

Area Moment of Inertia Converter

Convert Area Moment of Inertia units

Beam Support Forces Calculator

Calculate beam loads and support forces

Belt Transmissions - Length and Speed of Belts

Length and speed of belt and belt gearing

Belts - Power Transmissions and Efficiency

Calculate belts power transmissions and efficiency

Body Force acting on Inclined Planes

Force required to move bodies up inclined planes

Bollard Force

Bollard rope friction - the load and effort force in the rope

British Universal Columns and Beams

Properties of British Universal Steel Columns and Beams

Cable Loads

Tension in cable supporting uniformly load

Car Acceleration

Calculating car acceleration

Center Mass

Calculate position of center mass

Center of Gravity

Some common bodies and their center of gravity

Center of Gravity - Center of Buoyancy

Stability - center of gravity and center of buoyancy

Centripetal and Centrifugal Force - Acceleration

Centripetal and Centrifugal acceleration - force due to circular motion

Conservation of Momentum

The momentum of a body is defined as the product of its mass and velocity

Density, Specific Weight and Specific Gravity

An introduction to definition of density, specific weight and specific gravity - formulas with examples

Disk Brakes

Force and torque

Endurance Limits and Fatigue Stress

Endurance limits and fatigue stress for some steels


Energy is the capacity to do work

Engineering Materials

Typical properties of engineering materials like steel, plastics, ceramics and composites


Static equilibrium is achieved when both resultant force and resultant moment equals to zero

Fibre-reinforced Polymer Composites

Mechanical properties of fibers used to reinforce polymer composites

Flywheel Kinetic Energy

Flywheel kinetic energy and moment of inertia


Force - Newton's third law and acceleration

Force Moving Body on a Horizontal Plane

The force acting on a body moved along a horizontal plane

Force Ratio

Force ratio or mechanical advantage

Formulas of Motion - Linear and Circular

Linear and angular (rotation) acceleration, velocity, speed and distance

Gear Reducer Formulas

Output torque, speed and horsepower

Gear Trains

A simple gear train is used to transmit rotary motion


Gears and effort force

HE-A Steel Beams

Properties of HE-A profiled steel beams

HE-B Steel Beams

Properties of HE-B profiled steel beams

HE-M Steel Beams

Properties of HE-M profile steel beams

Hooke's Law

Hooke's law - force, elongation and spring constant

Improvised Torque Wrench

Use a luggage scale to improvise a torque wrench

Impulse and Impulsive Forces

Forces acting a very short time are called impulsive forces

Kinetic Energy

Kinetic energy of a rigid body is the energy possessed by the body motion


Forces with levers

Lifting Wheels

Lifting wheels and effort force

Mass and Weight

Mass and Weight - the difference

Metric Grades Steel Bolts

Metric steel bolts, screws and studs - proof and tensile strength

Modulus of Elasticity or Young's Modulus - and Tensile Modulus for some common Materials

Young's Modulus - Tensile Modulus or Modulus of Elasticity - for some common materials like steel, glass, wood ..

Modulus of Rigidity

Shear Modulus or Modulus of Rigidity is the coefficient of elasticity for a shearing or torsion force

Moment of Inertia

Moment of Inertia (Mass Moment of Inertia) depends on the mass of the object, its shape and its relative point of rotation - Radius of Gyration

Moment of Section Conversions

Convert Moment of Section (Inertia) units

Movement Ratio

Machines and the movement ratio (velocity ratio)

Normal Flange I Beams

Properties of normal flange I profile steel beams

Poisson's Ratios Metals

Some metals and their Poisson's ratios

Poisson's ratio

When a material is stretched in one direction it tends to get thinner in the other two directions

Potential Energy

Elevation and potential energy


Power is the rate at which work is done or energy converted

Pulley Diameters and Speeds

Pulley laws - driver and driven - diameter and rpm

Pulley Selection Charts

Pulley (Sheave) selection charts - motors ranging 850 - 3450 rpm


Pulleys, blocks and tackles


The radian - a unit of angle measure - angular velocity

Range of Projectile

Motion in two dimensions - calculate the range of a projectile like a bullet, ball ...

Rolling Resistance

Rolling friction and rolling resistance

Rotating Shafts and their Moments

Torsional moments acting on rotating shafts

SAE Grades Steel Bolts

SAE steel bolts - grades ranging grade 1 to 8.2 - proof and tensile strength

Screw Jacks

Screw jacks and effort force

Section Modulus - Convert between Units

Convert between Section Modulus units

Simple Harmonic Oscillator

A simple harmonic motion


Resistance to deflection


Applied force and cross-sectional area

Stress and Deflections of Beams

Beams and shafts - deflection and stress calculator

Stress in Thick-Walled Tubes or Cylinders

Radial and tangential stress in thick-walled tubes or cylinders with closed ends - internal and external pressure

Stress, Strain and Young's Modulus

Stress is force per area - strain is deformation of a solid due to stress

Stresses in Thin-Walled Tubes or Cylinders

Hoop and longitudinal stresses thin-walled tubes or cylinders

Tension Increase in Ropes due to Angle

Load capacity loss in ropes, cables or lines due to angle

Thermal Stresses

Stress due to restricting thermal expansion

Torque - Work done and Power transmitted

Work done and power transmitted by constant torque

Torque or Moment of Force - online Converter

Torque or moment - the tendency of a force to rotate an object

Torsion of Shafts

Torsion of solid and hollow shafts - Polar Moment of Inertia of an Area

Unified Screw Threads UNC and UNF - ANSI B1.1

UNC - Coarse series and UNF Fine series

Universal Gravitational Law

Gravitational attraction between two objects depends on the mass of the objects and the distance between them

Vector Addition

Online vector calculator - add vectors with different magnitude and direction

Wind Load

Wind load on a surface

Wire Rope Slings

Sling angles - and wire rope capacities


Work done is the product of applied force and distance

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