Sections

Key Terms
# Key Terms

- angular momentum
- the product of the moment of inertia and angular velocity

- change in momentum
- the difference between the final and initial values of momentum; the mass times the change in velocity

- elastic collision
- collision in which objects separate after impact and kinetic energy is conserved

- impulse
- average net external force multiplied by the time the force acts; equal to the change in momentum

- impulse–momentum theorem
- the impulse, or change in momentum, is the product of the net external force and the time over which the force acts

- inelastic collision
- collision in which objects stick together after impact and kinetic energy is not conserved

- isolated system
- system in which the net external force is zero

- law of conservation of momentum
- when the net external force is zero, the total momentum of the system is conserved or constant

- linear momentum
- the product of a system's mass and velocity

- point masses
- structureless particles that cannot rotate or spin

- recoil
- backward movement of an object caused by the transfer of momentum from another object in a collision