0

Guest

Courses New

the work done is zero when the force is acting perpendicular to the surface .this is becacuse cos90 is =0 .My question is why are we taking the angle between the force and displacement vector here.

the work done is zero when the force is acting perpendicular to the surface .this is becacuse cos90 is =0 .My question is why are we taking the angle between the force and displacement vector here.

Grade:10

1 Answers

Rajesh Sardar
32 Points
9 years ago
We know that work done is a scalar quantity and force and displacement both are vector quantity.
Again we know that the product of force and displacement caused by the force is called work done.
Hence we must take the dot product of force and displacement to get the work done by the force, which is a scalar quantity.
Therefore Work done, W = F (force)  .  X(displacement)
Now A . B = |A||B|cos(A,B)
So for taking dot product we must have to bring the angle between force and displacement.
 

Think You Can Provide A Better Answer ?

Other Related Questions on 9 grade science

View all Questions »

ASK QUESTION

Get your questions answered by the expert for free

Answer and earn gift vouchers

Win Gift vouchers upto Rs 500/-

View courses by askIITians

Design classes One-on-One in your own way with Top IITians/Medical Professionals

Click Here Know More

Complete Self Study Package designed by Industry Leading Experts

Click Here Know More

Live 1-1 coding classes to unleash the Creator in your Child

Click Here Know More

a Complete All-in-One Study package Fully Loaded inside a Tablet!

Click Here Know More