Physics

# Concept Items

PhysicsConcept Items

### Concept Items

#### 8.1Linear Momentum, Force, and Impulse

1.

What is impulse?

1. Change in velocity
2. Change in momentum
3. Rate of change of velocity
4. Rate of change of momentum
2.

In which equation of Newton’s second law is mass assumed to be constant?

1. $F=ma F=ma$
2. $F= Δp Δt F= Δp Δt$
3. $F=Δ pΔt F=Δ pΔt$
4. $F= Δm Δa F= Δm Δa$
3.
What is the SI unit of momentum?
1. \text{N}
2. \text{kg} \cdot \text{m}
3. \text{kg} \cdot \text{m/s}
4. \text{kg} \cdot \text{m/s}^2
4.

What is the equation for linear momentum?

1. $p=mv p=mv$
2. $p=m/v p=m/v$
3. $p=m v 2 p=m v 2$
4. $p= 1 2 m v 2 p= 1 2 m v 2$

#### 8.2Conservation of Momentum

5.

What is angular momentum?

1. The sum of moment of inertia and angular velocity
2. The ratio of moment of inertia to angular velocity
3. The product of moment of inertia and angular velocity
4. Half the product of moment of inertia and square of angular velocity
6.

What is an isolated system?

1. A system in which the net internal force is zero
2. A system in which the net external force is zero
3. A system in which the net internal force is a nonzero constant
4. A system in which the net external force is a nonzero constant

#### 8.3Elastic and Inelastic Collisions

7.

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?

1. Friction is zero.
2. Friction is nearly zero.
3. Friction acts constantly.
4. Friction before and after the impact remains the same.
8.

What is an inelastic collision?

1. when objects stick together after impact, and their internal energy is not conserved
2. when objects stick together after impact, and their internal energy is conserved
3. when objects stick together after impact, and always come to rest instantaneously after collision
4. when objects stick together after impact, and their internal energy increases
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