Home
Class 9
PHYSICS
A coin of mass 20 g is pushed on a table...

A coin of mass 20 g is pushed on a table. The coin starts moving at a speed of 25 cm `s^(1)` and comes to rest in 5 s. Find the average frictional force exerted by the table on the coin.

Text Solution

Verified by Experts

Use, `nu=u-at`
`a=5 xx 10(-2)m s^(-2),F=ma=1 xx 10^(-3) N`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • FRICTION

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES|9 Videos

  • FRICTION

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES (Read the given statements and select the correct option.)|1 Videos

  • FRICTION

    CENGAGE PHYSICS|Exercise CONSOLIDATED EXERCISE. (MULTIPAL-CHOICE QUESTION WITH ONE OR MORE THAN ONE CORRECT ANSWER)|3 Videos

  • ELASTICITY

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISES|10 Videos

  • SOUND

    CENGAGE PHYSICS|Exercise OLYMPIAD AND NTSE LEVEL EXERCISE|10 Videos

Similar Questions

Explore conceptually related problems

A train is moving at a speed of 100 m s^(-1) comes to rest in 5 seconds. Find its retardation.

A bullet of mass 50g moving with a speed of 500 ms^(-1) is brought to rest in 0.01s Find the impulse and the average force .

Knowledge Check

  • A 10 g bullet moving at 200 m/s stops after penetrating 5 cm of wooden plank. The average force exerted by the bullet will be

    A
    `2000`N
    B
    `-2000`N
    C
    `4000 `N
    D
    `-4000 `N

    • Similar Questions

    Explore conceptually related problems

    A cricket ball of mass 150 g moving with a velocity of 15 ms^(-1) is brought to rest by a player in 0.05 s. Calculate the impulse and the average force exerted by the player.

    A bullet of mass 20 g moving with a speed of 120 m/s hits a thick muddy wall and penetrates into it. It takes 0.03 s to stop in the wall find the force exerted by the bullet on the wall,

    A block of weight 5 units is placed on a horizontal table. A person pushes the block from top by exerting a downward force of 3 units on it. Find the force exerted by the table on the block.

    A small coin of mass 5 g is placed at a distance 5 cm from centre on a flat horizontal turn table. The turn table is observed to make 3 revolutions in sqrt(10)s . The frictional force on the coin is (n xx 10^(-3)) N . Find value of n .

    A disc starts rotating with a constant angular acceleration of 1 rad//s^(2) about a fixed vertical axis perpendicular to its plane and passing through its centre. A coin of mass 10 gm is placed on the disc at a distance of 10cm from the axis. The coefficent of friction between the disc and the coin is 0.2 . The value of the frictional force on the coin at t=1s will be

    Your physics book has a mass of 400 g. It is kept on a horizontal table. Taking g =10 m//s^2 , find the force (both magnitude and direction )exerted by the table on the physics book

    A box of mass 20kg is pushed along a rough floor with a velocity 2 m/s and then let go .The box moves 5m on the floor before coming to rest. What must be the frictional force acting on the box? " (1) 4N (2) 2N (3) 20N (4) 8N

    Home
    Profile