Question

scale: 1 cm = 1 n
which is the best description for the force vector drawn above?
a. -3 n
b. +3 n
c. -3 cm
d. +3 cm

Explanation:

Step1: Analyze the unit

The question is about force vector, so the unit should be Newton (N), not centimeter (cm). So options c and d can be excluded.

Step2: Analyze the direction

The arrow of the vector points to the right. Usually, right - hand direction is considered positive. Given the scale \(1\ cm = 1\ N\), and the length of the vector is \(3\ cm\).

Answer:

B. +3 N