Dot (Scalar) Product of Two Vectors

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Tutorial ID	Title	Tutorial	Video Tutorial	Revision Notes	Revision Questions
2.4	Dot (Scalar) Product of Two Vectors

Dot (Scalar) Product of Two Vectors Revision Questions

1. Two forces F⃗1 = 50N and F⃗2 = 100N are pulling the same object as shown in the figure.

What is the size of the angle θ between the two forces?

Remark! Pay attention to the sign of components.

1. 900
2. 170
3. 880
4. 609

Reveal AnswerCorrect Answer: A

2. A 300N force acts on an object at a certain angle to the horizontal direction and as a result, the object moves horizontally at 2m/s. The output power delivered is 480W. What is the angle of the force to the horizontal direction?

1. 300
2. 370
3. 530
4. 600

Reveal AnswerCorrect Answer: B

3. Two forces are acting on the same object at 530 to each other (cos 530 = 0.6, sin 530 = 0.8). Their dot product is 120 units and the magnitude of the first force is 20N. What is the magnitude of the second force in newtons?

1. 6N
2. 8N
3. 10N
4. 12N

Reveal AnswerCorrect Answer: C

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6. Continuing learning vectors and scalars - read our next physics tutorial: Rounding and Significant Figures

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