Learning Activities #4

REVIEW QUESTIONS


MOMENTUM

1.Which has a greater momentum,a heavy truck at rest to a moving skateboard?
Answer:A moving skateboard

IMPULSE

2.How does impulse differ from force?
Answer:Impulse is the product of the force acting on an object and the time during which it acts while force is any influence that can cause an object to be accelerated measured in neutrons.

4.What is the relationship of the impulse-momentum relationship to Newtons second law?
Answer:The time interval of impulse is buried in the term for acceleration and helps to analyze a variety of circumstances where momentum is change.

DECREASING MOMENTUM OVER ALONG TIME

9.Why might a wine glass survive a fall onto a carpeted floor but not into a concrete floor?
Answer:A wine glass survive a fall unto a carpeted floor not in a concrete because the carpeted floor with give allows for a longer time of impact and therefore a lesser force of impact force over along time to provide the required impulse to reduce the momentum of fall.

BOUNCING

14.Which undergoes the greater change in momentum;
1)A moving object brought to rest 2)the same object projected from rest to he speed it had before ;3)the same moving object brought to rest and then projected backward to its original speed?
Answer:a moving object brought to rest

EXERCISES

2.In terms of impulse and momentum,why are padded dashboard safer in automobiles
Answer:A person sitting inside an automobile pushing against the dashboard has no effect in changing the momentum of the automobile because these forces are are interval forces that forces that act and react within the objects themselves. An outside or external force acting
IN the baseball or automobiles is required for a change in momentum.If no external force is present,then no change in momentum is possible.

8.Why is a punch move forceful with a bare first than with a boxing gloves?
Answer:In both cases the impulses by the boxers jaw reduces the momentum of the punch A) a boxer is moving away when the gloves hits,thereby extending the time of contact.Much of the impulses therefore involves time.B.The boxer is moving into the glove,thereby lessening the time of contact.Much of the impulses therefore involves force.
therefore