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A **ton-force** is one of various units of force defined as the weight of one ton due to standard gravity.^{ [note 1] } The precise definition depends on the definition of *ton* used.

In physics, a **force** is any interaction that, when unopposed, will change the motion of an object. A force can cause an object with mass to change its velocity, i.e., to accelerate. Force can also be described intuitively as a push or a pull. A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newtons and represented by the symbol **F**.

In science and engineering, the **weight** of an object is related to the amount of force acting on the object, either due to gravity or to a reaction force that holds it in place.

The tonne-force (tf or t_{f})^{ [note 2] } is equal to the weight of one tonne.

The **tonne**, commonly referred to as the **metric ton** in the United States and Canada, is a non-SI metric unit of mass equal to 1,000 kilograms or one **megagram**. It is equivalent to approximately 2,204.6 pounds, 1.102 short tons (US) or 0.984 long tons (UK). Although not part of the SI, the tonne is accepted for use with SI units and prefixes by the International Committee for Weights and Measures.

one tonne-force = 1000 kilograms-force (kgf) = 65 9.806kilonewtons (kN) ≈ 2204.623 pounds-force (lbf) ^{ [note 3] }≈ 0.9842065 long tons-force ^{ [note 4] }≈ 1.1023113 short tons-force ^{ [note 5] }≈ 70931.64 poundals (pdl) ^{ [note 6] }

The long ton-force is equal to the weight of one long ton.

**Long ton**, also known as the **imperial ton** or **displacement ton**, is the name for the unit called the "ton" in the avoirdupois system of weights or Imperial system of measurements. It was standardised in the thirteenth century and is used in the United Kingdom and several other British Commonwealth of Nations countries alongside the mass-based metric tonne defined in 1799.

one long ton-force = 2240 lbf = 1016.0469088 kgf = 9.96401641818352 kN = 1.12 short tons-force ^{ [note 7] }≈ 72069.87 pdl ^{ [note 8] }

The short ton-force is equal to the weight of one short ton.

The **short ton** is a unit of mass equal to 2,000 pounds-mass. The unit is most commonly used in the United States where it is known simply as the *ton*.

one short ton-force = 2000 lbf = 74 907.184 kgf = 443230521 kN 8.896 ≈ 0.892857 long tons-force ^{ [note 9] }≈ 64348.10 pdl ^{ [note 10] }

- ↑ All calculations on this page assume the following definition of standard gravity,
*g*_{0}.*g*_{0}= 65 m/s^{2}9.806

- ↑ The tonne-force, also known as the metric ton-force, is equivalent to the megagram-force (Mgf or Mg
_{f}) and the megapond (Mp). - ↑
1 pound = 59237 kg ∴ 0.453 1 tonne-force = 1000/59237 0.453 lbf ≈ 2204.62262184887 lbf - ↑
1 long ton = 0469088 t ∴ 1.016 1 tonne-force = 1/1.0160469088 long tons-force ≈ 0.98420652761106 long tons-force - ↑
1 short ton = 18474 t ∴ 0.907 1 tonne-force = 1/18474 0.907 short tons-force ≈ 1.1023113109244 short tons-force - ↑
1 pdl = 0.138254954376 N ∴ 1 tonne-force = 9806.65/0.138254954376 pdl ≈ 70931.635283968 pdl - ↑
1 long ton-force = 2240/2000 short tons-force = 1.12 short tons-force - ↑
*g*_{0}= 65 9.806/0.3048 ft/s ^{2}∴1 long ton-force = 2240 lb × 65 9.806/0.3048 ft/s ^{2}= 27458620/381 pdl ≈ 72069.868766404 pdl - ↑
1 short ton-force = 2000/2240 long tons-force = 25/28 long tons-force ≈ 0.892857143 long tons-force - ↑
1 short ton-force = 2000 lb × 65 9.806/0.3048 ft/s ^{2}= 24516625/381 pdl ≈ 64348.09711 pdl

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The **kilogram** or **kilogramme** is the base unit of mass in the International System of Units (SI). Until 20 May 2019, it remains defined by a platinum alloy cylinder, the *International Prototype Kilogram*, manufactured in 1889, and carefully stored in Saint-Cloud, a suburb of Paris. After 20 May, it will be defined in terms of fundamental physical constants.

The **pound of force** or **pound-force** is a unit of force or weight used in some systems of measurement including English Engineering units and the British Gravitational System. Pound-force should not be confused with foot-pound, a unit of energy, or pound-foot, a unit of torque, that may be written as "lbf⋅ft"; nor should these be confused with pound-mass, often simply called *pound,* which is a unit of mass.

**Tonnage** is a measure of the cargo-carrying capacity of a ship. The term derives from the taxation paid on *tuns* or casks of wine. In modern maritime usage, "tonnage" specifically refers to a calculation of the volume or cargo volume of a ship. Tonnage should not be confused with displacement, which refers to the actual weight of the vessel. Tonnage is commonly used to assess fees on commercial shipping.

**Archimedes' principle** states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces and acts in the upward direction at the center of mass of the displaced fluid. Archimedes' principle is a law of physics fundamental to fluid mechanics. It was formulated by Archimedes of Syracuse.

The **gravitational force**, or more commonly, **g-force**, is a measurement of the type of acceleration that causes a perception of weight. Despite the name, it is incorrect to consider g-force a fundamental force, as "g-force" is a type of acceleration that can be measured with an accelerometer. Since g-force accelerations indirectly produce weight, any g-force can be described as a "weight per unit mass". When the g-force acceleration is produced by the surface of one object being pushed by the surface of another object, the reaction force to this push produces an equal and opposite weight for every unit of an object's mass. The types of forces involved are transmitted through objects by interior mechanical stresses. The g-force acceleration is the cause of an object's acceleration in relation to free fall.

The **kilogram-force**, or **kilopond**, is a gravitational metric unit of force. It is equal to the magnitude of the force exerted on one kilogram of mass in a 9.80665 m/s^{2} gravitational field. Therefore, one kilogram-force is by definition equal to 9.80665 N. Similarly, a gram-force is 9.80665 mN, and a milligram-force is 9.80665 μN. One kilogram-force is approximately 2.204622 pound-force.

In both road and rail vehicles, the **wheelbase** is the distance between the centers of the front and rear wheels. For road vehicles with more than two axles, the wheelbase is the distance between the steering (front) axle and the centerpoint of the driving axle group. In the case of a tri-axle truck, the wheelbase would be the distance between the steering axle and a point midway between the two rear axles.

**Deadweight tonnage** or **tons deadweight** (TDW) is a measure of how much weight a ship can carry, not its weight, empty or in any degree of load. DWT is the sum of the weights of cargo, fuel, fresh water, ballast water, provisions, passengers, and crew.

**Rolling resistance**, sometimes called **rolling friction** or **rolling drag**, is the force resisting the motion when a body rolls on a surface. It is mainly caused by non-elastic effects; that is, not all the energy needed for deformation of the wheel, roadbed, etc. is recovered when the pressure is removed. Two forms of this are hysteresis losses, and permanent (plastic) deformation of the object or the surface. Another cause of rolling resistance lies in the slippage between the wheel and the surface, which dissipates energy. Note that only the last of these effects involves friction, therefore the name "rolling friction" is to an extent a misnomer.

The **axle load** of a wheeled vehicle is the total weight felt by the roadway for all wheels connected to a given axle. Viewed another way, it is the fraction of total vehicle weight resting on a given axle. Axle load is an important design consideration in the engineering of roadways and railways, as both are designed to tolerate a maximum weight-per-axle ; exceeding the maximum rated axle load will cause damage to the roadway or rail tracks.

The **standard acceleration due to gravity**, sometimes abbreviated as **standard gravity**, usually denoted by *ɡ*_{0} or *ɡ*_{n}, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as 9.80665 m/s^{2}. This value was established by the 3rd CGPM and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from the rotation of the Earth ; the total is about 0.5% greater at the poles than at the Equator.

The **gravitational metric system** is a non-standard system of units, which does not comply with the International System of Units (SI). It is built on the three base quantities length, time and force with base units metre, second and kilopond respectively. Internationally used abbreviations of the system are **MKpS**, **MKfS** or **MKS** .
However, the abbreviation MKS is also used for the MKS system of units, which, like the SI, uses mass in kilogram as a base unit.

The **units of transportation measurement** describes the unit of measurement used to measure the quantity and traffic of transportation used in transportation statistics, planning, and their related fields.

The ** Hatsuharu-class destroyers** were a class of Imperial Japanese Navy destroyers in the service before and during World War II. The final two vessels in the class, completed after modifications to the design, are sometimes considered a separate "

In common usage, the **mass** of an object is often referred to as its **weight**, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object, whereas weight is the force exerted on an object by gravity. In other words, an object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons on the surface of the Earth, since the newton is a unit of force, while the kilogram is a unit of mass. The object's weight will be less on Mars, more on Saturn, and negligible in space when far from any significant source of gravity, but it will always have the same mass.