Home
Class 11
PHYSICS
As shown in fig. two identical balls str...

As shown in fig. two identical balls strike a rigid wall with equal speeds but a different angles of incidence. They are reflected back without any lose in speed.


(a) Determine the direction of force exerted by each ball on the wall.
(b) Determine the ratio of impulse imparted by the two balls on the wall in both cases.

Text Solution

Verified by Experts

(a) Force on a body acts in a direction of change in its momentum. In both cases change in momentum of ball is along XO. Hence, in both the cases force will be along x-direction on the wall.
(b) Case(a)
Momentum of the ball before reflection=`mv(along OX)`
Momentum after reflection `=-mv(along XO)`
Now, I=change in momentum of ball
`=-mv-mv=-2mv(along OX)=2mv("along x")`
Hence, implse on wall will be 2mv(along OX)
Case(b) Similarly `I'=-mv cos theta-mv cos theta=-2mv cos theta`

Ratio `=(I)/(I')=(2mv)/(2mv cos theta), (I)/(I')=(1)/(cos theta)`.
Promotional Banner

Topper's Solved these Questions

  • NEWTON'S LAWS OF MOTION 1

    CENGAGE PHYSICS|Exercise Exercise 6.2|35 Videos

  • NEWTON'S LAWS OF MOTION 1

    CENGAGE PHYSICS|Exercise Exercise 6.3|19 Videos

  • NEWTON'S LAWS OF MOTION 1

    CENGAGE PHYSICS|Exercise Solved Examples|11 Videos

  • MISCELLANEOUS VOLUME 2

    CENGAGE PHYSICS|Exercise INTEGER_TYPE|10 Videos

  • NEWTON'S LAWS OF MOTION 2

    CENGAGE PHYSICS|Exercise Integer type|1 Videos

Similar Questions

Explore conceptually related problems

Two identical billiard balls striks a rigid wall with the same speed but at different angles , and get reflected without any change in speed , as shown in Fig . What is (i) the direction of the force on the wall due to each ball ? (ii) the ratio of the magnitudes of impulses imparted to the balls by the wall ?

A ball of mass m strikes a rigid wall with speed v and gets reflected without any loss of speed, as shown in the figure. (a) What is the magnitude of the impulse imparted to the ball by the wall? (b) What is the direction of the force on the wall due to the ball?

Two billiard balls of equal mass 30 g strike a rigid wall with same speed of 108 kmph (as shown) but at different angles. If the balls get reflected with the same speed then the ratio of the magnitude of impulses imparted to ball 'a' and ball 'b' by the wall along 'X' direction is

A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

A ball of mass m strikes a rigid walJ with speed u and rebounds with the same speed. The impulse imparted to the ball by the wall is

A riding ball of mass m strikes a rigid wall at 60^(@) and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be.

Two identical balls each moving with speed v at right angle to each other collide perfectly inelastically. Their speed after collision is

A 3 kg ball strikes a heavy rigid wall with a speed of 10 ms^(-1) at an angle of 60^@ with the wall. It gets reflected with the same speed at 60^@ with the wall. If the ball is in contact with the wall for 0.2s , the average force exerted on the ball by the wall is