English

Explain How, a Karate Player Can Break a Pile of Tiles with a Single Blow of His Hand. - Science

Advertisements
Advertisements

Question

Explain how, a karate player can break a pile of tiles with a single blow of his hand.

Short/Brief Note
Advertisements

Solution

A karate player can break a pile of tiles with a single blow because he strikes the pile with his hand very fast. In doing so, the large momentum of his hand is reduced to zero in a very short time. This exerts a large force on the pile of tiles which is sufficient to break them apart.

shaalaa.com
  Is there an error in this question or solution?
Chapter 2: Force and Laws of Motion - Very Short Answers 1 [Page 55]

APPEARS IN

Lakhmir Singh Physics (Science) [English] Class 9 ICSE
Chapter 2 Force and Laws of Motion
Very Short Answers 1 | Q 21 | Page 55

Video TutorialsVIEW ALL [1]

RELATED QUESTIONS

A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei the products must move in opposite directions.


A stream of water flowing horizontally with a speed of 15 m s–1 gushes out of a tube of cross-sectional area 10–2 m2, and hits a vertical wall nearby. What is the force exerted on the wall by the impact of water, assuming it does not rebound?


Define momentum of a body. On what factors does the momentum of a body depend ?


A man throws a ball weighing 500 g vertically upwards with a speed of 10 m/s.

  1. What will be its initial momentum ?
  2. What would be its momentum at the highest point of its flight ?

Which physical quantity corresponds to the rate of change of momentum ?


Why would an aircraft be unable to fly on the moon ?


A truck of mass 500 kg moving at 4 m/s collides with another truck of mass 1500 kg moving in the same direction at 2 m/s. What is their common velocity just after the collision if they move off together ?


A heavy car A of mass 2000 kg travelling at 10 m/s has a head-on collision with a sports car B of mass 500 kg. If both cars stop dead on colliding, what was the velocity of car B ?


Suppose a ball of mass m is thrown vertically upward with an initial speed v, its speed decreases continuously till it becomes zero. Thereafter, the ball begins to fall downward and attains the speed v again before striking the ground. It implies that the magnitude of the initial and final momentums of the ball are the same. Yet, it is not an example of conservation of momentum. Explain why?


Two billiard balls A and B, each of mass 50 g and moving in opposite directions with speed of 5 ms–1 each, collide and rebound with the same speed. If the collision lasts for 10–3 s, which of the following statements are true?

  1. The impulse imparted to each ball is 0.25 kg ms–1 and the force on each ball is 250 N.
  2. The impulse imparted to each ball is 0.25 kg ms–1 and the force exerted on each ball is 25 × 10–5 N.
  3. The impulse imparted to each ball is 0.5 Ns.
  4. The impulse and the force on each ball are equal in magnitude and opposite in direction.

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×