Question

the work will be positive, if the angle between force and displacement is

a) 90 degree
b) 180 degree
c) 0 degree​

Answer 1

The work will be positive if the angle between force and displacement is 180 degrees.

What is work?

• Work is defined as the force that causes movement or displacement of an object over a distance.
• It is a scalar product of force if the force applied remains constant and the displacement also.
• It is represented by the following equation.
• W = F.s
• Here W is work, F is force and s is displacement.

So, the correct statement is 180 degrees.

#SPJ2

Answer 2

Explanation:

We know that,

$\sf Work = \vec{f} · \vec{s} \: cos \: θ$

When θ is 90°,

Work = fs cos 90° = 0

When θ is 180°,

Work = fs cos 180° = -fs

When θ is 0°,

Work = fs cos 0° = fs

So, θ is 180°