Inelastic Collisions
What is an inelastic collision?
two objects stick together when they collide
What is elastic collision?
a collision in which there is no net loss in kinetic Energy in the system as a result as collision.
What is the coefficient of restitution for a perfectly inelastic collision?
0
A student hits a .4 kg white billiard ball giving it an initial speed of 5 m/s. It hits a blue billiard ball with the same mass initially at rest. Afterwards, the blue billiard ball is traveling 5 m/s. What is the final speed of the white billiard ball?
0 m/s; it is at rest.
A 2200kg car traveling at 30ms collides with another 2200kg car that is at rest. The two bumpers lock and the cars move forward together. What is their final velocity?
15m/s
Each croquet ball in a set has a mass of .45 kg. The green ball travels at 8.9 m/s and strikes a stationary red ball. If the green ball stops moving, what is the final speed of the red ball after the collision?
8.9 m/s
A 0.25 kg arrow with a velocity of 12 m/s to the west strikes and pierces the center of a 6.8 kg target. What is the final velocity of the combined mass? What is the decrease in kinetic energy during the collision?
0.43 m/s to the west; 17 J of KE lost
A bowling ball with a mass of 4 kg strikes a pin with a mass of 1.8 kg. The pin flies forward with a velocity of 4 m/s, and the ball continues forward at 3 m/s. What was the original velocity of the ball?
4.8 m/s
During practice, a student kicks a 0.40 kg soccer ball with a velocity of 8.5 m/s to the south into a 0.15 kg bucket lying on its side. The bucket travels with the ball after the collision. What is the final velocity of the combined mass? What is the decrease in kinetic energy during the collision?
6.2 m/s to the south; 3.0 J KE lost
A bowling ball with a mass of 4 kg strikes a pin with a mass of 1.8 kg. The pin flies forward with a velocity of 4 m/s, and the ball continues forward at 3 m/s. What was the original velocity of the ball?
4.8 m/s