Question

what are the positive and the negative forces.class 8 science.​

Answer 1

Answer:

Positive work

When force and displacement are in the same direction, the work performed on an object is said to be positive work.

Example: When a body moves on the horizontal surface, force and displacement act in the forward path. The work is done in this case known as Positive work.

Negative work

Negative work is performed if the displacement is opposite to the direction of the Force applied.

Example: Work was done the gravity on a rocket going perpendicular upwards.

Answer 2

Positive work follows when the force has a component parallel to the displacement. Positive work adds energy to a system. Negative work follows when the force has a component opposite or against the displacement. ... The force of friction opposes the displacement (always), and does negative work