4
.
A block sits on the floor of an elevator that is moving downward while reducing speed. Draw below a free
-
body diagram of the block, showing only vectors representing the forces acting on the b

Question

4
.
 ﻿A block sits on the floor of an elevator that is moving downward while reducing speed. Draw below a free
-
body diagram of the block, showing only vectors representing the forces acting on the block 
(
no velocity vectors, acceleration vectors, etc.
)
.
 ﻿Vectors representing stronger forces must be drawn longer than vectors representing weaker forces. Label each force vector and describe each force in words.
5
.
 ﻿Identify all the forces acting on a baseball that is flying directly rightward toward the pitcher immediately after losing contact with the surface of the bat. 
(
Air drag is not negligible.
)
 ﻿Then, draw a free
-
body diagram of the baseball, showing only vectors representing the forces acting on the baseball 
(
no velocity vectors, acceleration vectors, etc.
)
.
 ﻿Model it as a point particle, label each force vector, and describe in words what type of force it is

VIPSolutions · Accepted Answer

# Problem 4: Free-Body Diagram of a Block in a Descending Elevator

Description
A block rests on the floor of an elevator moving downward with decreasing speed (i.e., upward acceleration).

### Forces Acting on the Block:
- **Gravitational force ($ \vec{F}_g $)**: The weight of the block, acting downward.
- **Normal force ($ \vec{N} $)**: The contact force exerted by the floor on the block, acting upward.

### Free-Body Diagram
- Draw the block as a point.
- **Force vectors:**
  - $ \vec{F}_g $: Longer arrow pointing downward.
  - $ \vec{N} $: Shorter arrow pointing upward (since the elevator is decelerating downward, the normal force is greater than the weight).

### Labeling and Description:
- **Normal force ($ \vec{N} $)**: Force exerted by the elevator floor on the block.
- **Gravity ($ \vec{F}_g $)**: Gravitational pull of Earth on the block.

---

# Problem 5: Forces on a Baseball Moving Rightward

## Description
A baseball is flying directly rightward immediately after losing contact with the bat. Air drag acts on the baseball, opposing its motion.

### Forces Acting on the Baseball:
- **Gravitational force ($ \vec{F}_g $)**: Acts downward.
- **Air drag force ($ \vec{F}_d $)**: Acts opposite the direction of motion (leftward).

### Free-Body Diagram
- Model the baseball as a point particle.
- **Force vectors:**
  - $ \vec{F}_g $: Downward arrow.
  - $ \vec{F}_d $: Leftward arrow (opposite to the rightward motion).

### Labeling and Description:
- **Gravity ($ \vec{F}_g $)**: Force due to Earth's gravity.
- **Air drag ($ \vec{F}_d $)**: Resistive force from air, acting opposite to the baseball's velocity.

---

**Note:** Vectors should be drawn with lengths proportional to their magnitudes, with stronger forces represented by longer arrows.

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