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 Newton’s second law is mass assumed to be constant?
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\text{N}
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\text{kg} \cdot \text{m}
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\text{kg} \cdot \text{m/s}
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\text{kg} \cdot \text{m/s}^2
What is the equation for linear momentum?
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 p1 + p2 = 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