Applications of vector dot product in physics

I have to present shortly five applications of vector dot product in physics, for example: W=F*s. I am not quite clear about vectors, so could someone advise me.
 
335
0
How much do you know already? Depending on that, I'd advise you to google the definition of a vector or watch some of Walter Lewin's Physics I video lectures at ocw.mit depending on your level of understanding.
 

berkeman

Mentor
54,308
4,717
The dot product is used often for finding the fraction of a vector quantity that is applicable in a particular direction. Like if you are pushing with a force vector in 3-space (x,y,z), and you want to know the component of that total force that is directed in the horizontal x axis, for example. Or you are calculating the EMF (electromotive force) along a wire in 3-space, resulting from a general electric field distribution....
 

HallsofIvy

Science Advisor
41,626
821
The main application is finding the "projection" of a vector on another vector or a direction. A variant of that is using the dot product to determine if two vectors or two directions are at right angles. Of course, the angle itself between two directions is determined using the dot product.
 

The Physics Forums Way

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top