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22 January, 10:03

1. It takes a 25 N force to push a 250 N box across the floor.

a. How much work is done against friction when the box is moved 2 m across the floor?

b. How much work is done against gravity when the box is lifted 2 m above the floor?

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Answers (1)
  1. 22 January, 13:33
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    A: - 50 J

    B: - 500 J

    Explanation:

    a) Given that a 25 N force is applied to move the box. Also the floor is having friction surface.

    So in order to move the box, the floor should have friction of atleast 25 N.

    ∴ friction = 25 N

    Work done = force * displacement of box

    Given, the box is moved 2 m across the floor

    So, Work done = friction * 2 m

    = 25 * 2

    = 50 J

    b) Given, the box is having weight of 250 N weight

    Gravitational force is acting on the box which is equal to (mass * gravity)

    ∴ Force = 250 N

    The box is lifted 2 m above the floor.

    So, displacement = 2 m

    Work done = force * displacement of box

    Work done = 250 * 2

    = 500 J
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