You have 2 carts that will pass by 2 photogates to measure velocity. One photoga

Question

You have 2 carts that will pass by 2 photogates to measure velocity. One photogate is on the 30 cm mark and the other is on the 90 cm.

1) If we use a spring to cause an collision of two carts initially at rest, with equal mass, which of the following is expected:

A) Conservation of momentum, and constant kinetic energy

B) Momentum not conserved, but constant kinetic energy

C) Momentum not conserved, and kinetic energy not constant

D) Conservation of momentum, but kinetic energy not constant

2) Now if a stationary cart is struck by a moving cart and the two carts bounce apart in a (nearly) totally elastic collision, with equal mass, what's expected

A) Conservation of momentum, and constant kinetic energy

B) Momentum not conserved, and kinetic energy not constant

C) Conservation of momentum, but kinetic energy not constant

D) Momentum not conserved, but constant kinetic energy

3) Now suppose the unloaded masses of cart 1 and cart 2 is 263 g and 223 g. If cart 1 has a speed of 0.914 m/s before the collision, what is the expected speed of cart 2 after the collision if a stationary cart is struck by a moving cart and the two carts stick together?

4) When using a loaded cart, the photogate may measure speeds that are either unexpectedly small or large. This is likely due to:

A) most of the momentum of the system is in the unloaded cart

B) most of the momentum of the system is in the loaded cart

C) the photogate being triggered by some part of the extra mass

D) most of the energy of the system is in the loaded cart

E) most of the energy of the system is in the unloaded cart

Explanation / Answer

1)

A) Conservation of momentum, and constant kinetic energy

2)

C) Conservation of momentum, but kinetic energy not constant

3)

4)

A) most of the momentum of the system is in the unloaded cart

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