8.4 Elastic Collisions in One Dimension

What is conserved in an elastic collision?

• Heat energy

• Internal kinetic energy only

• Momentum only

• Momentum and internal kinetic energy

What is internal kinetic energy?

• The potential energy of the system

• The energy due to heat transfer

• The sum of the kinetic energies of the objects in the system

• The energy stored in the springs of the system

Which of the following is an example of a nearly elastic collision?

• Two wooden blocks on a table

• Two cars colliding on a highway

• Two steel blocks on ice

• Two rubber balls on a rough surface

What is the equation for conservation of momentum in a one-dimensional elastic collision?

• m1v1 + m2v2 = m1v'1 + m2v'2

• m1v1 - m2v2 = m1v'1 - m2v'2

• m1v1 = m2v2

• m1v1 + m2v2 = m1v1 + m2v2

What is the equation for conservation of internal kinetic energy in a one-dimensional elastic collision?

• m1v1 + m2v2 = m1v'1 + m2v'2

• 1/2 m1v1^2 = 1/2 m2v2^2

• 1/2 m1v1^2 + 1/2 m2v2^2 = 1/2 m1v'1^2 + 1/2 m2v'2^2

• m1v1^2 + m2v2^2 = m1v'1^2 + m2v'2^2

What happens to the internal kinetic energy in a truly elastic collision?

• It is partially lost

• It is conserved

• It is converted into sound energy

• It is completely converted into heat energy

What is the velocity of the larger object after the collision in the example provided?

• 1.00 m/s

• 0.00 m/s

• 4.00 m/s

• -3.00 m/s

What is the velocity of the smaller object after the collision in the example provided?

• 1.00 m/s

• 4.00 m/s

• 0.00 m/s

• -3.00 m/s

What is the net external force on the system during an elastic collision?

• Zero

• Equal to the kinetic energy of the system

• Equal to the velocity of the system

• Equal to the mass of the system

What is the purpose of using icy surfaces or air tracks in experiments involving elastic collisions?

• To create heat energy during collisions

• To increase the speed of the objects

• To reduce friction and allow nearly elastic collisions

• To prevent objects from moving