Inclined Planes Basic 6 Basic Technology Lesson Note

LEARNING OBJECTIVES By the end of the lesson, pupils should be able to:

1. Mention examples of inclined planes
2. Construct and use inclined planes to move objects
3. State the advantages of inclined plane

DEFINITION OF INCLINED PLANE

An inclined plane is a simple machine that consists of a flat surface tilted at an angle. It is a sloping surface that connects a lower level to a higher level. It makes it easier to move heavy objects up or down by reducing the effort needed.

Other Names:

• Ramp
• Slope
• Slant

EXAMPLES OF INCLINED PLANES

In Everyday Life:

1. Ramps: Used at building entrances for wheelchairs and trolleys
2. Slides: Children’s playground equipment
3. Road on Hills: Winding roads going up mountains
4. Stairs: Series of small inclined planes
5. Ladders: Leaning against walls
6. Escalators: Moving inclined planes in shopping malls
7. Roofs: Slanted to allow rain water to flow down
8. Chisels: Sharp inclined edge for cutting
9. Axe: Wedge-shaped blade
10. Knife: Sharp slanted edge
11. Wheelchair Ramps: At hospitals and public buildings
12. Loading Ramps: For loading goods into trucks
13. Pyramid Sides: Ancient Egyptians used ramps to build pyramids
14. Aircraft Boarding Stairs: Mobile stairs for entering planes
15. Skateboard Ramps: For tricks and stunts

PARTS OF AN INCLINED PLANE

1. Base: The horizontal bottom part
2. Height (Vertical Rise): How high the plane goes
3. Length (Slope): The slanting surface
4. Angle: The steepness of the slope

HOW INCLINED PLANES WORK

When you push an object up an inclined plane:

• You use less force (effort) than lifting it straight up
• You move the object over a longer distance
• The work done is the same, but it’s easier

Example:

• Lifting a 50kg box straight up 2 meters is very hard
• Pushing the same box up a 10-meter ramp to reach 2 meters height is much easier
• You travel longer distance but use less force

FORMULA: Effort needed reduces as the length of the slope increases Mechanical Advantage = Length of Slope ÷ Height

TYPES OF INCLINED PLANES

1. Simple Ramp: Single flat slope
2. Wedge: Two inclined planes joined back-to-back Examples: Axe, knife, nail, needle, chisel
3. Screw: Inclined plane wrapped around a cylinder Examples: Bolt, jar lid, light bulb base, corkscrew

CONSTRUCTING A SIMPLE INCLINED PLANE

Materials Needed:

• Wooden plank or strong cardboard
• Books or blocks (for support)
• Small toy car or wheeled object
• Ruler (to measure)

Steps:

1. Place several books stacked on top of each other (this is your height)
2. Rest one end of the plank on top of the books
3. Rest the other end on the floor or table
4. You now have an inclined plane

Experiment:

1. Try lifting the toy car straight up to the top of the books
2. Now roll or push the car up the inclined plane
3. Notice which method is easier

ADVANTAGES OF INCLINED PLANES

1. Reduces Effort: Less force needed to move heavy objects
2. Makes Work Easier: Heavy loads can be moved with less strain
3. Safer: Reduces risk of injury from lifting heavy objects
4. Versatile: Can be used in many situations
5. Simple and Cheap: Easy to construct with basic materials
6. No Energy Source Needed: Works without electricity or fuel
7. Accessible: Helps people with disabilities access buildings
8. Efficient: Moves large quantities of goods easily
9. Reduces Time: Faster than carrying objects up and down
10. Durable: Lasts long with little maintenance

DISADVANTAGES OF INCLINED PLANES

1. Takes up more space than stairs or elevators
2. Requires longer distance to travel
3. Can be dangerous if too steep
4. Difficult for people without wheels or trolleys
5. Slippery when wet

USES OF INCLINED PLANES

In Construction:

• Loading heavy materials onto trucks
• Moving wheelbarrows with cement
• Accessing different building levels

In Transportation:

• Highway overpasses and underpasses
• Bridge approaches
• Parking garage ramps
• Airport runways

In Daily Life:

• Wheelchair access to buildings
• Moving furniture up to trucks
• Children’s playground slides
• Skateboarding and skating ramps

In Agriculture:

• Loading farm produce onto vehicles
• Grain chutes in storage facilities
• Barn ramps for animals

EVALUATION

1. What is an inclined plane?
2. Give five examples of inclined planes
3. Draw and label the parts of an inclined plane
4. State four advantages of inclined planes
5. How does an inclined plane make work easier?

MULTIPLE CHOICE QUESTIONS

An inclined plane is also called a ________

• a) Lever
• b) Ramp
• c) Pulley
• d) Wheel

Which of these is NOT an inclined plane?

• a) Slide
• b) Ramp
• c) Seesaw
• d) Stairs

An inclined plane reduces the ________ needed

1. a) Distance
2. b) Time
3. c) Effort
4. d) Speed

A knife is an example of ________

• a) Lever
• b) Wedge (inclined plane)
• c) Pulley
• d) Wheel

The flat sloping surface of an inclined plane is called ________

• a) Base
• b) Height
• c) Length or slope
• d) Angle

Wheelchair ramps are inclined planes used for ________

• a) Playing
• b) Accessibility
• c) Decoration
• d) Storage

A screw is an inclined plane wrapped around a ________

• a) Square
• b) Triangle
• c) Cylinder
• d) Pyramid

Which makes an inclined plane easier to use?

• a) Making it very steep
• b) Making it longer and less steep
• c) Making it shorter
• d) Making it narrow

Roofs are slanted to ________

• a) Look beautiful
• b) Allow rain to flow down
• c) Save money
• d) Provide shade

An axe is an example of ________

• a) Lever
• b) Pulley
• c) Wedge (inclined plane)
• d) Wheel

ANSWERS: 1.b 2.c 3.c 4.b 5.c 6.b 7.c 8.b 9.b 10.c

HOMEWORK

1. Draw three examples of inclined planes you see in your school or home
2. Explain with a diagram how an inclined plane makes work easier
3. List eight uses of inclined planes in real life
4. Design and draw an inclined plane that could help load goods into a truck
5. Write the differences between an inclined plane and a lever