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When a ball is moving on plain ground, t...

When a ball is moving on plain ground, the work done by the frictional force on the ball is

A

positive

B

Negative

C

zero

D

Undefined

Text Solution

Verified by Experts

The correct Answer is:
B
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Knowledge Check

  • A ball of mass 10 gm dropped from a height of 5 m hits the floor and rebounds to a height of 1.25 m. If the ball is in contact with the ground for 0.1s, the force exerted by the ground on the ball is (g = 10 m/ s^(2) )

    A
    0.5 N
    B
    1.5 N
    C
    0.15 N
    D
    2.5 N

  • A ball of mass 10 gm dropped from a height of 5 m hits the floor and reboundsd to a height of 1.25 m. If the ball is in contact with the ground for 0.1 s, the force exerted by the ground on the ball is (g=10 m//s^(2))

    A
    0.5 N
    B
    1.5 N
    C
    0.15 N
    D
    2.5 N

  • A ball of mass 'm' moving with a speed 2v strikes a heavy wall elastically, which is moved with a velocity 'v'. The work done by the heavy wall on the ball is

    A
    `(1)/(2) mv^(2)`
    B
    `mv^(2)`
    C
    `2mv^(2)`
    D
    None

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    (A) : When a bicycle is in motion, the force of friction exerted by the ground on the two wheels is always in forward direction. (R ) : The frictional force only when the bodies are in contact.

    A body of mass 2 kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1 . Compute the Work done by the net force on the body in 10s.

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