Which of the following statements is/are correct about work?

In a certain reference frame,

W_{p s e u d o f o r c e} + W_{c o n s e r v a t t i v e f o r c e} + W_{n o n - c o n s e r v a t t i v e f o r c e} + W_{o t h e r f o r c e s} = Δ K

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Work done by friction is always negative.

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Work done by a force is defined as the dot product of the force and the displacement of the point of application of force.

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Work done by conservative force in moving a body from A to B = potential energy of the body at A - potential energy of the body at B

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Solution

The correct options are
A In a certain reference frame, $W_{p s e u d o f o r c e} + W_{c o n s e r v a t t i v e f o r c e} + W_{n o n - c o n s e r v a t t i v e f o r c e} + W_{o t h e r f o r c e s} = Δ K$
C Work done by a force is defined as the dot product of the force and the displacement of the point of application of force.
D Work done by conservative force in moving a body from A to B = potential energy of the body at A - potential energy of the body at B
According to work energy theorem the work done by all forces is equal to the change in kinetic energy.
$W_{p s e u d o} + W_{c} + W_{n c} + W_{o t h e r} = Δ K$
work $= \to F . \to S$
potential energy can only be changed by conservative forces.

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