1. the correct technique for a karate chop (e.g., a blow that will shatter a num

Question

1. the correct technique for a karate chop (e.g., a blow that will shatter a number of wooden boards or a concrete or two) involves striking the object very fast, very hard. how does this work?

2. what condition is necessary in order that momentum be conserved? state the conservation of momentum principle.

3. define impulse.

4. define elastic collision.

5. give some examples of elastic collision.

6. define inelastic collisions.

7. describe what happens after a completely inelastic collision.

8. what happens to the lost kinetic energy during an inelastic collision?

Explanation / Answer

1). As F= m.dv/dt , so harder and faster we apply the force the acceleration of the hand will be higher and this will impart a greater impact for the wooden board to break. 2). No external force should be acting on the system for the conservation of its momentum. According to this principle, in the absence of any external force the net momentum of the system is always constant w.r.t time. 3). Impulse is the force applied on a body for a very short time. => Impulse = change in momentum of the body. 4). Elastic collision is the type of collision in which the total K.E. of the colliding bodies before the collision remains constant after collision. 5). elastic collisions generally only occur at an atomic level (collisions between subatomic particles or between particles in a gas) 6). Inelastic collisions are those in which energy is lost - generally via friction of some kind. It also takes energy in order to deform an object (but deformation isn't necessary ). 7). A perfectly inelastic collision occurs when the maximum amount of kinetic energy of a system is lost. In a perfectly inelastic collision, i.e. a zero coefficient of restitution, the colliding particles stick together. 8). the lost K.E. is lost due to friction of some kind.

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