8.1 Linear Momentum, Force, and Impulse
When does the net force on an object increase?
- When Δp decreases
- When Δt increases
- When Δt decreases
In the equation Δp = m(vf − vi), which quantity is considered to be constant?
- Initial velocity
- Final velocity
8.2 Conservation of Momentum
In the equation L = Iω, what is I?
- Linear momentum
- Angular momentum
- Moment of inertia
Give an example of an isolated system.
- A cyclist moving along a rough road
- A figure skater gliding in a straight line on an ice rink
- A baseball player hitting a home run
- A man drawing water from a well
8.3 Elastic and Inelastic Collisions
In which type of collision is kinetic energy conserved?
In physics, what are structureless particles that cannot rotate or spin called?
- Elastic particles
- Point masses
- Rigid masses
Two objects having equal masses and speeds collide with each other and come to rest. What type of a collision is this and why?
- Elastic collision, because internal kinetic energy is conserved
- Inelastic collision, because internal kinetic energy is not conserved
- Elastic collision, because internal kinetic energy is not conserved
- Inelastic collision, because internal kinetic energy is conserved