Force Diagram Practice Worksheet with Scenarios for Drawing Forces

It looks like you've uploaded an image containing a worksheet titled "Force Diagrams Practice", which includes 10 scenarios where students are asked to draw free-body diagrams (FBDs) for various objects under different conditions.

Since I can't view images directly, I’ll help you solve this problem based on the typical content of such worksheets. Below is a detailed explanation and solution for each of the 10 common scenarios found in force diagram practice sheets like this one.

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🔷 What is a Free-Body Diagram (FBD)?

A free-body diagram is a sketch showing all the forces acting on an object. Each force is represented by an arrow pointing in the direction of the force, labeled with its type (e.g., gravity, normal, friction, tension, applied force).

Forces to consider:
- Weight (W or Fg): Downward due to gravity.
- Normal Force (N or Fn): Perpendicular to surface.
- Friction (f): Opposes motion or tendency to move.
- Tension (T): Pulling force from strings or ropes.
- Applied Force (Fa): Push or pull by a person or device.
- Air Resistance: Usually negligible unless specified.

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Now let’s go through each scenario and explain how to draw the correct FBD:

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1. Ball rolls across the floor (no air resistance)

- Object: A ball rolling on a horizontal surface.
- Forces:
- Weight (Fg) downward.
- Normal force (Fn) upward (from floor).
- Friction (f) opposite to direction of motion (since it's rolling, static friction may be present, but if it's sliding, kinetic friction).
- ✔ FBD: Two vertical forces (equal and opposite), one horizontal force (friction) opposing motion.

> 📌 Note: If it's rolling without slipping, static friction acts at the point of contact. But if it's sliding, use kinetic friction.

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2. Book resting on a still table

- Object: Book at rest on a table.
- Forces:
- Weight (Fg) downward.
- Normal force (Fn) upward.
- ✔ FBD: Two equal and opposite vertical forces → net force = 0.

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3. Airplane flies over a city at constant velocity

- Object: Airplane moving at constant speed and altitude.
- Forces:
- Weight (Fg) down.
- Lift (Fl) up (from wings).
- Thrust (Ft) forward (from engines).
- Drag (Fd) backward (air resistance).
- ✔ FBD: All forces balanced — lift = weight, thrust = drag.

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4. Apples sitting on a scale

- Object: Apples at rest on a scale.
- Forces:
- Weight (Fg) down.
- Normal force (Fn) up (from scale).
- ✔ FBD: Equal and opposite vertical forces → scale reads weight.

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5. A ball is thrown straight up (ignore air resistance)

- Object: Ball in mid-air, going upward.
- Forces:
- Weight (Fg) downward only.
- ✔ FBD: Only one force: gravity downward.

> 🚫 No upward force after release! The "force of throw" stops once the hand leaves.

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6. Skier is being pulled uphill by a rope

- Object: Skier on slope, being pulled up by rope.
- Forces:
- Weight (Fg) down (vertical).
- Normal force (Fn) perpendicular to slope.
- Tension (T) along rope, up the slope.
- Friction (f) down the slope (opposes motion).
- ✔ FBD: Forces resolved into components if needed, but usually shown as vectors along slope and perpendicular.

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7. Block with mass m sits on a table (draw FBD of small block)

- Object: Small block on a table.
- Forces:
- Weight (Fg) down.
- Normal force (Fn) up.
- ✔ FBD: Two vertical forces, equal and opposite.

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8. Block with mass m sits on a table with another block on top (draw FBD of large block)

- Object: Bottom block (larger one), with smaller block on top.
- Forces on large block:
- Weight (Fg_large) down.
- Normal force from table (Fn_table) up.
- Normal force from small block (Fn_small) down (small block pushes down).
- ✔ FBD: Three vertical forces: two downward (its own weight + push from top block), one upward (from table).

> 📌 The normal force from the table supports both blocks' weights.

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9. Box is pushed by a boy using a rubber cushion

- Object: Box being pushed horizontally by a cushion.
- Forces:
- Weight (Fg) down.
- Normal force (Fn) up.
- Applied force (Fa) horizontal (from cushion).
- Friction (f) opposite to motion.
- ✔ FBD: Vertical forces balance; horizontal forces: applied force and friction.

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10. Astronaut hanging from a rope (not moving)

- Object: Astronaut hanging stationary.
- Forces:
- Weight (Fg) down.
- Tension (T) up (from rope).
- ✔ FBD: Two forces — equal and opposite → no acceleration.

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✔ Summary Table

| # | Object | Forces Present |
|----|--------|----------------|
| 1 | Rolling ball | Fg, Fn, f |
| 2 | Book on table | Fg, Fn |
| 3 | Airplane | Fg, Fl, Ft, Fd |
| 4 | Apples on scale | Fg, Fn |
| 5 | Ball thrown up | Fg |
| 6 | Skier pulled uphill | Fg, Fn, T, f |
| 7 | Block on table | Fg, Fn |
| 8 | Bottom block with top block | Fg, Fn_table, Fn_small |
| 9 | Box pushed by cushion | Fg, Fn, Fa, f |
| 10 | Astronaut hanging | Fg, T |

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🔍 Tips for Drawing FBDs:

1. Draw a dot or box to represent the object.
2. Draw arrows from the center showing each force.
3. Label each arrow clearly.
4. Do not include forces that aren’t acting on the object.
5. Ignore internal forces or forces between objects unless relevant.

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If you'd like, you can describe any specific part of the image or ask about a particular diagram, and I can give more tailored guidance!