Scalars and Vectors
Physics · 50 practice questions
Definitions and examples of scalar and vector quantities; relative velocity; resolution of vectors into two perpendicular directions, including graphical methods.
- Distinguish between scalar and vector quantities and give examples.
- Determine the resultant of two or more vectors.
- Determine relative velocity.
- Resolve vectors into two perpendicular components.
- Use graphical methods to solve vector problems.
Try a few questions
- Practice question 1
The relative velocity of two objects moving directly toward each other (in opposite directions) is mainly found by
- A.adding their individual speeds together
- B.subtracting the smaller speed from the larger speed
- C.multiplying their individual speeds together
- D.averaging their individual speeds
Show the answer
A. adding their individual speeds together
For objects approaching each other, their speeds combine additively to give the relative velocity.
- Practice question 2
Two forces of 6N and 8N act at right angles to each other at a point. Their resultant is
- A.14N
- B.2N
- C.10N
- D.48N
Show the answer
C. 10N
By Pythagoras, resultant = √(6² + 8²) = √100 = 10N.
- Practice question 3
Two forces of 3N and 4N act at right angles to each other at a point. Their resultant is mainly
- A.7N
- B.5N
- C.1N
- D.12N
Show the answer
B. 5N
By Pythagoras, resultant = √(3² + 4²) = √25 = 5N.
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