Krisha Prasad

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Krisha Prasad

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Krisha Prasad

Asked: October 27, 2020In: Class 9

According to the third law of motion when we push on an object, the object pushes back on us with an equal and opposite force. If the object is a massive truck parked along the roadside, it will probably not move. A student justifies this by answering that the two opposite and equal forces cancel each other. Comment on this logic and explain why the truck does not move.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-12

Krisha Prasad

Asked: October 27, 2020In: Class 9

A hockey ball of mass 200 g travelling at 10 m s–1 is struck bya hockey stick so as to return it along its original path with a velocity at 5 m s–1. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-13

Krisha Prasad

Asked: October 27, 2020In: Class 9

A bullet of mass 10 g travelling horizontally with a velocity of 150 m s–1 strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-14

Krisha Prasad

Asked: October 27, 2020In: Class 9

An object of mass 1 kg travelling in a straight line with a velocity of 10 m s–1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-15

Krisha Prasad

Asked: October 27, 2020In: Class 9

An object of mass 100 kg is accelerated uniformly from a velocity of 5 m s–1 to 8 m s–1 in 6 s. Calculate the initial and final momentum of the object. Also, find the magnitude of the force exerted on the object.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-16

Krisha Prasad

Asked: October 27, 2020In: Class 9

How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 m s–2.

NCERT Solutions for Class 9 Science Chapter 9 Force and Laws of Motion NCERT Books for Session 2022-2023 CBSE Board and UP Board Exercises Questions Page No-129 Questions No-18

Krisha Prasad

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