5.2.2 Inelastic Collisions in One Dimension Flashcards
Inelastic Collisions in One Dimension
- n elastic collisions with no net external force, you can combine conservation of energy and conservation of momentum to analyze the collision.
- In inelastic collisions, kinetic energy is converted into heat; conservation of mechanical energy does not apply. If there is no net external force, you can still use conservation of momentum
Conservation of momentum is violated when an object on a hill gains speed as it slides down the hill.
false
A student throws a wet paper towel directly at a cart on an airtrack. The cart is initially at rest and has a mass of 300 g. The paper towel has a mass of 10 g. The paper towel collides with and sticks to the cart moving it horizontally. The speed after the collision is 0.25 m / s. Therefore, over 95% of the towel’s initial kinetic energy is lost in the collision.
true
A 2 kg block is attached to a spring. The spring has a spring constant of 200 N / m, and is compressed with the block a distance of 0.2 meters. When the spring is released, the block moves forward over a frictionless surface and collides inelastically with a second block of mass 1 kg at the spring’s equilibrium position. The 1 kg block is initially at rest. What is the maximum distance the spring will compress after the collision?
0.16 m
A ballistic pendulum is a pendulum consisting of a large block of material hanging by a string. Bullets are fired into the block, causing the pendulum to swing. If a bullet with a mass of 20g is fired 250 m/s into a wood block with a mass of 2.0 kg, how fast will the combined bullet-block mass move immediately after the collision?
2.48 m / s
Two clay balls roll toward each other and collide head-on. One ball has a mass of 0.5 kg and moves to the left with an initial speed of 2 m / s. The other ball moves to the right with an initial speed of 3 m / s. The two balls stick together upon colliding with each other. The combined mass moves to the right with a speed of 1.5 m / s. What is the mass of the second ball?
1.2 kg
A 150 g golf ball sitting on a tee at rest is struck by a golf club. The total time the club and ball are in contact with each other is 0.006 s. If the ball moves away from the club at 30 m / s, what is the net force exerted by the club on the ball?
750 N
One train car with mass m1 moves to the right at a speed v1 and links together with a second car of mass m2, which is moving at a slower speed v2 to the right. Which of the following expressions gives the correct final speed of the two cars?
(m1v1 + m2v2) / (m1 + m2)
A 3 kg block moves horizontally on a frictionless surface and collides inelastically with a second block of mass 1 kg that is at rest at the base of a hill. If the two blocks move up the hill to a vertical height of 0.30 meters, what was the original speed of the 3 kg block?
3.23 m / s
A block with a mass of 2 kg slides along a frictionless, horizontal surface with a speed of 2 m / s. It collides with a second block of mass 4 kg, which is sitting at the base of a 30° frictionless incline. The two blocks collide inelastically. What is the vertical height that the two blocks will slide up the incline?
2.3 cm
