Which of the following statements is TRUE? a.In everyday life, completely inelas
ID: 1354005 • Letter: W
Question
Which of the following statements is TRUE?
a.In everyday life, completely inelastic collisions are relatively easy to observe compared to elastic collisions.
b.In this lab, we define the system as the two carts, the track, and the earth.
c.Momentum is always conserved within a system no matter how we choose the system.
d.In everyday life, elastic collisions are relatively easy to observe compared to completely inelastic collisions.
Which of the following statements about two carts rolling on a track and experiencing a completely inelastic collision is TRUE?
a.The kinetic energy of the system is conserved to good approximation.
b.The momentum of the system is conserved to good approximation.
c.The sum of the velocities of the two carts just before and just after the collision is approximately the same.
According to this experiment, which of the following statements is TRUE?
a."Massive" means to add weights to both carts.
b."Massive" means to add weights to a single specified cart.
c.If you accidentally touch a cart during a collision, the momentum of the system is still probably conserved.
d.You must continue to push cart #1 during the collision to complete the motion.
To approximate an elastic collision in this experiment, you should:
a. Orient the carts so that the magnets attached to the carts face each other.
b.Orient the carts so that the Velcro strips face each other.
c.Take off the Velcro strips.
d.Take off the magnets to allow a sharp contact during collision
Explanation / Answer
Answer of the 1st question is 'a' because in real life during collisions alot of objects stick together i.e. completely inelastic.
In the 2nd Question option 'b' The momentum of the system is conserved to good approximation, is correct. This is because an inelastic collision is a collision in which kinetic energy is not conserved. Meanwhile, inelastic collisions may not conserve kinetic energy, but they do obey conservation of momentum.
In the third question,"Massive" means to add weights to a single specified cart as it doesn't matter if one cart is heavier than the other, the push force from one cart will equal the push force from the other. Because the resulting motion (after the collision) is driven by the acceleration the body takes from the collision, while in contact with the other object, so the massive cart doesn't feel the collision, while impact on the other cart will be more.
In the last question, if the carts have equal mass then we orient the carts so that their magnetic bumpers are toward each other and the collision will be elastic.
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