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Tài liệu tham khảo về định luật Newton bằng tiếng Anh | Newton unit - Wikipedia the free encyclopedia Page 1 of 3 Newton unit From Wikipedia the free encyclopedia The newton symbol N is the SI derived unit of force named after Isaac Newton in recognition of his work on classical mechanics. Contents 1 Definition 2 Examples 3 Common use of kilonewtons in construction 4 Conversion factors 5 See also 6 References Definition The newton is the unit of force derived in the SI system it is equal to the amount of force required to accelerate a mass of one kilogram at a rate of one metre per second per second. Algebraically . . i sz Examples 1 N is the force of Earth s gravity on an object with a mass of about 102 g 1 9.8 kg such as a small apple . On Earth s surface a mass of 1 kg exerts a force of approximately 9.80665 N down or 1 kgf . The approximation of 1 kg corresponding to 10 N is sometimes used as a rule of thumb in everyday life and in engineering. The force of Earth s gravity on a human being with a mass of 70 kg is approximately 687 N. The dot product of force and distance is mechanical work. Thus in SI units a force of 1 N exerted over a distance of 1 m is 1 N-m of work. The Work-Energy Theorem states that the work done on a body is equal to the change in energy of the body. 1 N-m 1 J joule the SI unit of energy. It is common to see forces expressed in kilonewtons or kN where 1 kN 1 000 N. Common use of kilonewtons in construction Kilonewtons are often used for stating safety holding values of fasteners anchors and more in the building industry. 2 They are also often used in the specifications for rock climbing equipment. The safe working loads in both tension and shear measurements can be stated in kN kilonewtons . http en.wikipedia.org wiki Newton unit 10 3 2009 Newton unit - Wikipedia the free encyclopedia Page 2 of 3 1 kN equals 101.97162 kilograms of load but multiplying the kN value by 100 is a good rule of thumb. 3 Conversion factors Units of force newton SI unit dyne kilogram-force kilopond pound-force .
