Physics

# Multiple Choice

PhysicsMultiple Choice

### 8.1Linear Momentum, Force, and Impulse

21.
What kind of quantity is momentum?
1. Scalar
2. Vector
22.

When does the net force on an object increase?

1. When Δp decreases
2. When Δt increases
3. When Δt decreases
23.

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

1. Initial velocity
2. Final velocity
3. Mass
4. Momentum
24.
For how long should a force of $50 upper N$ be applied to change the momentum of an object by $12 kg dot m slash s$?
1. $0.24 s$
2. $4.15 s$
3. $62 s$
4. $600 s$

### 8.2Conservation of Momentum

25.

In the equation L = Iω, what is I?

1. Linear momentum
2. Angular momentum
3. Torque
4. Moment of inertia
26.

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

### 8.3Elastic and Inelastic Collisions

27.

In which type of collision is kinetic energy conserved?

1. Elastic
2. Inelastic
28.

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

1. Elastic particles
2. Point masses
3. Rigid masses
29.

Two objects having equal masses and velocities collide with each other and come to a 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
30.
Two objects having equal masses and velocities collide with each other and come to a rest. Is momentum conserved in this case?
1. Yes
2. No