Forces And Motion: Units
Gbogbo ọrọ náà
Physics problems fall apart when the units are wrong. A speed given in kilometres per hour cannot be plugged straight into an equation that expects metres per second, and a force stated without its unit is just a number. Knowing which unit belongs to which quantity is the first step in every calculation.
This reference covers the nine SI and derived units you need for the Forces and motion section of the Edexcel specification: kilogram, metre, metre per second, metre per second squared, newton, second, newton per kilogram, newton metre, and kilogram metre per second. You will practise recalling them quickly and converting between related forms.
Ebumnobi
- Use the following units: kilogram (kg), metre (m), metre/second (m/s), metre/second2 (m/s2), newton (N), second (s) and newton/kilogram (N/kg)
- Use the following units: newton metre (Nm), kilogram metre/second (kg m/s)
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Ekele diri gi maka imecha ihe karịrị na Forces And Motion: Units. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
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- What is the SI unit of force? A) kg B) m/s C) N D) J Answer: C
- Which unit measures gravitational field strength? A) N B) N/kg C) kg m/s D) m/s2 Answer: B
- Momentum is measured in: A) N m B) kg m/s2 C) kg m/s D) N/kg Answer: C
- A speed of 90 km/h is equivalent to: A) 9 m/s B) 25 m/s C) 90 m/s D) 250 m/s Answer: B
- The moment of a force is measured in: A) N B) N/kg C) N m D) kg m/s Answer: C
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Physical Quantities and Units
The range of objects and phenomena studied in physics is immense. From the incredibly short lifetime of a nucleus to the age of the Earth, from the tiny sizes of sub-nuclear particles to the vast distance to the edges of the known universe, from the force exerted by a jumping flea to the force betwe
"College Physics: Physical Quantities and Units" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/college-physics/pages/1-2-physical-quantities-and-units. Access for free at https://openstax.org/books/college-physics/pages/1-introduction
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