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A hockey ball of mass 200g travelling at 10m s^{-1} is struck

Science

Class 9

NCERT

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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.

A hockey ball of mass

200

g travelling at

10

s^{- 1}

is struck by a hockey stick so as to return it along its original path with a velocity at

5

s^{- 1}

. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

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 of the force exerted by the wooden block on the bullet.

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Chapter 14: Improvement in Food Resources

Chapter 15: Gravitation

29 questions

Question

Easy

Solving time: 3 mins

A hockey ball of mass $200$ g travelling at $10$ m $s^{- 1}$ is struck by a 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.

Views: 5,833 students

Updated on: Jul 17, 2023

Book:

Science (NCERT)

Found 7 tutors discussing this question

Samuel Discussed

A hockey ball of mass

200

g travelling at

10

s^{- 1}

is struck by a hockey stick so as to return it along its original path with a velocity at

5

s^{- 1}

. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

11 mins ago

Discuss this question LIVE

11 mins ago

Text solutionVerified

Mass of the hockey ball, m = 200 g = 0.2 kg
Hockey ball travels with velocity, u = 10 m/s
The change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

Initial momentum of the ball =

m u = 200 g \times 10 m s^{- 1} = 2000 g . m . s^{- 1}

Final momentum of the ball =

m v = 200 g \times -5 m s^{- 1} = -1000 g . m . s^{- 1}

Therefore, the change in momentum

(m v - m u) = -1000 g . m . s^{- 1} -2000 g . m . s^{- 1} = -3000 g . m . s^{- 1}

This implies that the momentum of the ball reduces by

1000 g . m . s^{- 1}

after being struck by the hockey stick.

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Practice more questions from Science (NCERT)

A hockey ball of mass

200

g travelling at

10

s^{- 1}

is struck by a hockey stick so as to return it along its original path with a velocity at

5

s^{- 1}

. Calculate the change of momentum occurred in the motion of the hockey ball by the force applied by the hockey stick.

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 of the force exerted by the wooden block on the bullet.

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Question Text	A hockey ball of mass $200$ g travelling at $10$ m $s^{- 1}$ is struck by a 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.
Updated On	Jul 17, 2023
Topic	Force and Laws of Motion
Subject	Science
Class	Class 9
Answer Type	Text solution:1 Video solution: 12
Upvotes	1267
Avg. Video Duration	7 min

A hockey ball of mass $200$ g travelling at $10$ m $s^{- 1}$ is struck by a 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.

Text solutionVerified

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

Text solutionVerified

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A hockey ball of mass $200$ g travelling at $10$ m $s^{- 1}$ is struck by a 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.