Concept Items
8.1 Linear Momentum, Force, and Impulse
What is impulse?
 Change in velocity
 Change in momentum
 Rate of change of velocity
 Rate of change of momentum
In which equation of Newtonâ€™s second law is mass assumed to be constant?
 $\text{F}=ma$
 $\text{F}=\frac{\text{\xce\u201d}\text{p}}{\text{\xce\u201d}t}$
 $\text{F}=\text{\xce\u201d}\text{p}\text{\xce\u201d}t$
 $\text{F}=\frac{\text{\xce\u201d}m}{\text{\xce\u201d}a}$

\text{N}

\text{kg} \cdot \text{m}

\text{kg} \cdot \text{m/s}

\text{kg} \cdot \text{m/s}^2
What is the equation for linear momentum?
 $\text{p}=m\text{v}$
 $\text{p}=m\text{/}\text{v}$
 $\text{p}=\text{m}{\text{v}}^{2}$
 $\text{p}=\frac{1}{2}\text{m}{\text{v}}^{2}$
8.2 Conservation of Momentum
What is angular momentum?
 The sum of moment of inertia and angular velocity
 The ratio of moment of inertia to angular velocity
 The product of moment of inertia and angular velocity
 Half the product of moment of inertia and square of angular velocity
What is an isolated system?
 A system in which the net internal force is zero
 A system in which the net external force is zero
 A system in which the net internal force is a nonzero constant
 A system in which the net external force is a nonzero constant
8.3 Elastic and Inelastic Collisions
In the equation p_{1} + p_{2} = p'_{1} + p'_{2} for the collision of two objects, what is the assumption made regarding the friction acting on the objects?
 Friction is zero.
 Friction is nearly zero.
 Friction acts constantly.
 Friction before and after the impact remains the same.
What is an inelastic collision?
 when objects stick together after impact, and their internal energy is not conserved
 when objects stick together after impact, and their internal energy is conserved
 when objects stick together after impact, and always come to rest instantaneously after collision
 when objects stick together after impact, and their internal energy increases