Bill Nye the Science Guy: Simple Machines worksheet with vocabulary and questions on simple machines.

Thank you for uploading the worksheet! Since I can’t see the image directly, I’m working from the text you’ve provided — which appears to be a “Bill Nye the Science Guy: Simple Machines” worksheet. This is a classic educational activity designed to reinforce concepts about simple machines through fill-in-the-blank and matching questions.

Let’s solve each question step by step with clear explanations.

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1. Simple machines change the ___ and/or ___ of forces.

✔ Answer: *direction* and/or *size*

Explanation:
Simple machines don’t create energy — they just make work easier by changing either:
- The direction of the force (e.g., pulling down on a rope to lift something up via a pulley), or
- The size (magnitude) of the force (e.g., using a lever to lift a heavy rock with less effort).

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2. Circle the items below that are simple machines:

> A CHAIR WHEELS PULLEYS BONES RAMPS A SCREW

✔ Circle: *WHEELS, PULLEYS, RAMPS, A SCREW*

Explanation:
Simple machines are basic mechanical devices that transmit or modify force. The six classical simple machines are:
- Lever
- Wheel and axle
- Pulley
- Inclined plane (ramp)
- Wedge
- Screw

So:
- Wheels = part of wheel & axle
- Pulleys = direct match
- Ramps = inclined plane
- A screw = a type of inclined plane wrapped around a cylinder

Not simple machines:
- A chair = furniture, not a machine
- Bones = biological structures, though they *act like levers*, they aren’t classified as simple machines in physics

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3. A catapult is a type of ___

✔ Answer: *lever*

Explanation:
A catapult uses a long arm (beam) pivoted on a fulcrum — this is the definition of a lever. When you apply force to one end, it launches an object from the other end.

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4. A part of a lever that pivots is called the ___

✔ Answer: *fulcrum*

Explanation:
Every lever has three parts:
- Fulcrum = pivot point
- Effort = where force is applied
- Load = what you’re moving

The fulcrum is the fixed point the lever rotates around.

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5. Circle the items below that are levers:

> A HAMMER PULLING A NAIL A DOORKNOB A CROWBAR A SCREW YOUR FOREARM

✔ Circle: *A HAMMER PULLING A NAIL, A CROWBAR, YOUR FOREARM*

Explanation:
- Hammer pulling a nail: The claw acts as a lever with the hammer head as the fulcrum.
- Crowbar: Classic example of a lever — pry bar.
- Your forearm: When you lift something with your hand, your elbow is the fulcrum, bicep applies effort, hand holds load → lever system!

Not levers:
- Doorknob = wheel and axle
- Screw = inclined plane

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6. A group of wheels pivoting around the same fulcrum can make a ___

✔ Answer: *wheel and axle*

Explanation:
This is describing the wheel and axle simple machine — a wheel attached to a smaller axle so that turning one turns the other. Example: doorknob, car steering wheel, bicycle pedals.

Note: “Pivoting around the same fulcrum” might be slightly misleading — technically, the axle rotates within the wheel, but they share a common center/axis.

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7. Gears are wheels with ___

✔ Answer: *teeth*

Explanation:
Gears are toothed wheels that mesh together to transmit rotational motion and force. The teeth interlock to prevent slipping.

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8. A ___ allows you to spread out work by walking a longer distance.

✔ Answer: *ramp* (or *inclined plane*)

Explanation:
An inclined plane (like a ramp) reduces the amount of force needed to lift something by increasing the distance over which the force is applied. You walk farther, but push/pull with less force.

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9. A spiral staircase is a lot like a ___

✔ Answer: *screw*

Explanation:
A screw is essentially an inclined plane wrapped around a cylinder. A spiral staircase wraps upward like a screw thread — so it’s analogous to a screw.

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10. A screw is a ___ wrapped around a ___

✔ Answer: *inclined plane* wrapped around a *cylinder*

Explanation:
If you unwind a screw, you’d get a slanted ramp — that’s an inclined plane. So a screw is an inclined plane coiled around a central cylinder.

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11. Another name for a ramp is a(n) ___

✔ Answer: *inclined plane*

Explanation:
In physics, “ramp” and “inclined plane” are interchangeable terms. It’s one of the six classical simple machines.

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12. The distance between the threads on a screw is called the ___

✔ Answer: *pitch*

Explanation:
Pitch = the distance between adjacent threads on a screw. A screw with wide spacing (large pitch) moves more per turn; fine pitch = more turns needed for same movement.

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## ✔ Final Answer Key:

1. direction, size
2. WHEELS, PULLEYS, RAMPS, A SCREW
3. lever
4. fulcrum
5. A HAMMER PULLING A NAIL, A CROWBAR, YOUR FOREARM
6. wheel and axle
7. teeth
8. ramp (or inclined plane)
9. screw
10. inclined plane, cylinder
11. inclined plane
12. pitch

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📌 Bonus Tip for Students:
Remember the 6 simple machines:
Lever
Wheel & Axle
Pulley
Inclined Plane
Wedge
Screw

You can remember them with the acronym: LWP IWS or “Lew’s Pizza Is Weirdly Spicy” 😄

Let me know if you want a printable version or flashcards for these terms!