## Friday, 24 October 2014

### IMPULSE AND WORK

Directions: On this worksheet you will examine the properties of force vs time (impulse) and force vs distance (work) as they apply to two objects of different masses.  Question 1  Two masses, 3 kg and 6 kg, initially at rest, are both pushed by equal forces through the same distance across identical frictionless surfaces. Which mass would experience the greater acceleration?
 3 kg 6 kg both masses experience the same acceleration

Question 2  Which mass has the greater final velocity?
 6 kg 3 kg both masses experience the same increase in velocity

Question 3  Which mass gained the greater amount of kinetic energy?
 6 kg 3 kg both masses gain the same amount of kinetic energy

Question 4  Which mass received the greater impulse?
 both masses require the same amount of time to reach the end 3 kg 6 kg

Question 5  If each mass was pushed by a 30-N force through a distance of 78 meters, what is the ratio of the change in momentum of the 3-kg mass to that of the 6-kg mass?
 1.41:1 0.71:1 1:1 0.50:1

Question 6  What is the final velocity of the 3-kg mass?
 5.0 m/sec 39.5 m/sec 27.9 m/sec 10.0 m/sec

Question 7  How much time was required for the 6-kg mass to travel the entire 78 meters?
 1.97 sec 2.79 sec 5.59 sec 3.95 sec

Question 8  Which formula correctly relates an object's kinetic energy and its momentum?
 KE = ½(p2/m) KE = 2m/p2 KE = ½(p2/v) KE = 2v/p2

Question 9  Regardless of which mass is being examined, which graph will always has the greater area?
 both are always equal Force vs Distance neither is always larger Force vs Time