# Dot (Scalar) Product of Two Vectors

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Vectors and Scalars Learning Material
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2.4Dot (Scalar) Product of Two Vectors

## Dot (Scalar) Product of Two Vectors Revision Questions

1. Two forces F1 = 50N and F2 = 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

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

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

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