Question 1

What is a Newton?

Accepted Answer

A Newton is the SI unit of force. It is the force needed to accelerate 1 kg at 1 m/s².

Question 2

How many Newtons is 1 pound-force?

Accepted Answer

1 pound-force (lbf) equals approximately 4.44822 Newtons.

Question 3

What is the difference between a poundal and a pound-force?

Accepted Answer

A poundal (pdl) is an absolute unit: the force needed to accelerate 1 pound at 1 ft/s² (≈ 0.138 N). A pound-force (lbf) is the gravitational force on 1 pound of mass (≈ 4.448 N), about 32.174 times larger.

Question 4

What is a dyne?

Accepted Answer

A dyne is the CGS unit of force. 1 dyne = 10⁻⁵ N = 1 g·cm/s². It is used in surface tension measurements. The surface tension of water is about 72.8 dyn/cm.

Sthène to Kilogram-force

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