Multiple Choice
In the SI system, what units are used to measure velocity?
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1. Intro to Physics Units
Introduction to Units
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In the SI system, what is the unit of force?
A
pascal (Pa)
B
watt (W)
C
newton (N)
D
joule (J)
Verified step by step guidance1
Recall that force is defined as mass times acceleration, which is expressed by Newton's second law: \(F = m \times a\).
In the SI system, mass (\(m\)) is measured in kilograms (kg) and acceleration (\(a\)) is measured in meters per second squared (\(m/s^2\)).
Therefore, the unit of force is the product of the units of mass and acceleration: \(\text{kg} \times m/s^2\).
This combined unit is named the newton (N), so 1 newton is defined as 1 kg·m/s².
Other units listed, such as pascal (Pa), watt (W), and joule (J), represent pressure, power, and energy respectively, and are not units of force.
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