Multiple Choice
In introductory physics, which units are used to measure both speed and velocity?
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Table of contents
- 0. Math Review31m
- 1. Intro to Physics Units1h 29m
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- Intro to Acceleration7m
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- 32. Electromagnetic Waves2h 14m
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- 35. Special Relativity2h 10m
1. Intro to Physics Units
Introduction to Units
Multiple Choice
In the SI system, what is the unit of force?
A
newton (N)
B
watt (W)
C
pascal (Pa)
D
joule (J)
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Verified step by step guidance1
Recall that force is defined as mass times acceleration according to Newton's second law: \(F = m \times a\).
In the SI system, mass is measured in kilograms (kg) and acceleration in meters per second squared (\(m/s^2\)).
Therefore, the unit of force is derived by multiplying the unit of mass (kg) by the unit of acceleration (\(m/s^2\)), giving \(kg \cdot m/s^2\).
This derived unit is named the newton (N), so 1 newton equals 1 kilogram meter per second squared: \(1\,N = 1\,kg \cdot m/s^2\).
The other units listed (watt, pascal, joule) correspond to power, pressure, and energy respectively, not force.
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