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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
---|---|---|---|---|---|---|

2.4 | Dot (Scalar) Product of Two Vectors |

*1. Two forces F ⃗1 = 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.

- 900
- 170
- 880
- 609

**Correct 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?*

- 300
- 370
- 530
- 600

**Correct 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?*

- 6N
- 8N
- 10N
- 12N

**Correct Answer: C**

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