IMPULS ,MOMENTUM & TUMBUKAN

Materi Kelas XI sem:1 

IMPULSE, MOMENTUM AND COLLISION

1.       Two cars A and B each has a mass of mA = 1500 kg and mB = 1000 kg . If both cars move at the same velocity of 30 m/s, where A moves eastward and B northward , determine :

a.       The momentum of each car

b.       The sum of momentum of both cars and the direction

2.       An object of 1 kg in mass is at rest, then it is hit by a force F so that it moves at velocity of 8 m/s. If hitter touches the body for 0,02 second , determine :

a.       The change of momentum of the body

b.       The magnitude of force F acting upon the body

3.       A body with a mass of 1 kg moves to positive x axis at a velocity of 2 m/s. Another body with a mass of 2 kg moves at a velocity of 2 m/s in opposite direction. After colliding , both move together, Determine the velocity of both and the direction .

4.       A bullet with a mass of 5 gram is fired at a wooden block with a mass of 4 kg. The bullet touches the block and mests in it. The velocity of the bullet when touching the block is 200 m/s. Calculate the velocity of the system ( block + bullet ) after collision ?.

5.       Two block each with a mass of m1 = 2 kg and  m2 = 3 kg move in opposite direction , each velocity is V1 = 3 m/s dan  V2 = 2 m/s. Calculate the velocity of both if the collision is perfectly elastic ?

6.       A gun of 2 kg in mass shoots a projectile of 2 g in mass and a velocity of 400 m/s. Calculate the velocity of the gun because of the repulsion ?.

7.       A machine gun fires a – 50 grams projectile at a velocity of 1000 m/s . The shooter holds the gun by giving a force of 180 N to it. How many projectiles can be fired every minute ?.

8.         A table tennis ball falls freely from 4 meters height. If the coefficient of of restitution between the floor  and the table tennis ball is 0,25 , then after colliding with the floor , the ball swill bounce to a height of . . . .