Educational worksheet on simple machines, including matching exercises and fill-in-the-blank questions with relevant images.

Let's solve this Simple Machines Worksheet step by step, explaining each answer clearly.

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Part 1: Matching

We are matching the simple machines (1–7) with their correct definitions (A–G).

#### 1. Lever
- Definition: Turns on a point called a fulcrum
- Correct match: F

> A lever is a rigid bar that pivots around a fixed point called the fulcrum, like a seesaw or crowbar.

#### 2. Inclined Plane
- Definition: Is a ramp
- Correct match: D

> An inclined plane is a flat surface set at an angle to help lift objects, such as a ramp or slope.

#### 3. Wedge
- Definition: Can either hold things together or split things apart
- Correct match: C

> A wedge is a type of inclined plane that moves; examples include axes, knives, and nails.

#### 4. Screw
- Definition: An incline plane wound around a cylinder
- Correct match: A

> A screw is essentially an inclined plane wrapped around a cylinder, like a bolt or jar lid.

#### 5. Pulley
- Definition: Wheels with grooves around the rim
- Correct match: G

> A pulley consists of a wheel with a groove around its edge, used to change the direction of a force when pulling a rope.

#### 6. Wheel and Axle
- Definition: Two machines in one: helps roll heavy objects more easily, or it can be used to open doors.
- Correct match: E

> The wheel and axle system uses a larger wheel attached to a smaller axle to reduce effort (e.g., doorknobs, steering wheels).

#### 7. Gears
- Definition: Measured by the number of teeth it has
- Correct match: B

> Gears are toothed wheels that transfer motion and force between parts of a machine; their size and number of teeth determine how they interact.

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✔ Part 1 Answers:

1. F
2. D
3. C
4. A
5. G
6. E
7. B

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Part 2: Fill in the Blanks

Now let’s analyze each image and fill in the blank based on the context.

#### 1. The surface of a ski slope is an example of a (an) _________.
- Image shows a skier going down a hill.
- A ski slope is a ramp — which is an inclined plane.
- ✔ Answer: Inclined plane

#### 2. The part of the oar indicated by the arrow is an example of a (an) _________.
- Image shows a person rowing a boat, with an arrow pointing to the handle end of the oar.
- The oar acts as a lever, where the pivot point (where it rests in the boat) is the fulcrum.
- The handle is where you apply force — so it's part of a lever.
- ✔ Answer: Lever

> Note: The entire oar is a lever, but the part being pointed to is the effort arm of the lever.

#### 3. A doorknob is an example of a (an) _________.
- Image shows a doorknob.
- A doorknob is a wheel and axle system — turning the wheel (knob) rotates the axle inside the door.
- ✔ Answer: Wheel and axle

#### 4. A simple machine useful for raising a flag is a (an) _________.
- Image shows a flag on a pole with a rope going over a pulley.
- This is a classic example of a pulley.
- ✔ Answer: Pulley

#### 5. The part of the ax indicated by the arrow is a (an) _________.
- Image shows an ax with the arrow pointing to the blunt edge or head of the ax.
- But wait — the cutting edge is the wedge. However, if the arrow points to the sharp side, it's the wedge.
- Since the image likely shows the blade (the sharp edge), it's the wedge.
- ✔ Answer: Wedge

> Even though the whole ax is a tool, the wedge is the simple machine component responsible for splitting wood.

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✔ Part 2 Answers:

1. Inclined plane
2. Lever
3. Wheel and axle
4. Pulley
5. Wedge

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✔ Final Answer Key:

#### Part 1: Matching
1. F
2. D
3. C
4. A
5. G
6. E
7. B

#### Part 2: Fill in the Blanks
1. Inclined plane
2. Lever
3. Wheel and axle
4. Pulley
5. Wedge

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