Physics – Off Axis Collisions wksht NAME: ___________________
1. Which of the following best describes a perfectly inelastic collision free of external forces?
A) Total linear momentum is never conserved
B) Total linear momentum is sometimes conserved.
C) KE is never conserved.
D) KE is sometime conserved.
E) KE is always conserved.
2.) Two carts having masses of 1.5 kg and .7 kg, respectively, are initially at rest and are held together by a compressed massless spring. When released, the 1.5 kg cart moves to the left with a velocity of 7 m/s. What is the velocity and direction of the .7 kg cart? (15 m/s to the right)
3.) A mass of 2 kg is moving at a speed of 10 m/s along a horizontal, frictionless surface. It collides, and sticks, with a 3 kg mass moving in the same direction at 5 m/s.
A) What is the final velocity of the system after the collision? ( 7 m/s)
B) What percentage of KE was lost in the collision? (11%)
ANGLE COLLISIONS:
4.) A .2 kg brass ball is initially at rest on a frictionless horizontal surface. It is hit by a .3 kg steel ball moving horizontally with a velocity of 2 m/s. After the collision, the 2 kg disk has a velocity of 1 m/s at an angle of 250 to the positive x-axis.
A) Determine the velocity and direction of the .3 kg steel ball after the collision.
B) Determine the amount of KE lost in the collision.
5.)A Ball 1 is 2 kg, and collides with ball 2 of mass 1 kg as shown in the picture to the right. The final velocity of ball 2 is 4m/s at 300 below the X-axis.
A) Determine the velocity of ball 1 after the collision.
B) Is this collision elastic or inelastic? If it is inelastic, how much KE was lost during the collision?