Multiple Choice

When does the net force on an object increase?

1. When Δp decreases
2. When Δt increases
3. When Δt decreases

In the equation Δp = m(v_f − v_i), which quantity is considered to be constant?

1. Initial velocity
2. Final velocity
3. Mass
4. Momentum

In the equation L = Iω, what is I?

1. Linear momentum
2. Angular momentum
3. Torque
4. Moment of inertia

Give an example of an isolated system.

1. A cyclist moving along a rough road
2. A figure skater gliding in a straight line on an ice rink
3. A baseball player hitting a home run
4. A man drawing water from a well

In which type of collision is kinetic energy conserved?

1. Elastic
2. Inelastic

In physics, what are structureless particles that cannot rotate or spin called?

1. Elastic particles
2. Point masses
3. 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?

1. Elastic collision, because internal kinetic energy is conserved
2. Inelastic collision, because internal kinetic energy is not conserved
3. Elastic collision, because internal kinetic energy is not conserved
4. Inelastic collision, because internal kinetic energy is conserved