A sloping surface, such as a ramp. An inclined plane can be used to alter the effort and distance involved in doing work, such as lifting loads. The trade-off is that an object must be moved a longer distance than if it was lifted straight up, but less force is needed. You can use this machine to move an object to a lower or higher place. Inclined planes make the work of moving things easier. You would need less energy and force to move objects with an inclined plane.
Ramps student designed investigation
Egyptian pyramids are great monument of a great civilization that was born seven thousand years ago. The ancient Egyptians built more than 90 royal pyramids, from about 2630 BC until about 1530 BC. During that time, the pyramid shape evolved from a series of stepped terraces to sloped pyramidal shape.
The first pyramid, the Step Pyramid at Saqqara, was constructed during the reign of King Djoser (Zoser) (2630 BC-2611 BC). The largest pyramid in Egypt is the one built for King Khufu, in Giza. Khufu’s pyramid, known as the Great Pyramid, is the only one of the Seven Wonders of the World that still exists.
Egyptian pyramids were originally built to serve as tombs for kings and queens. After a ruler died, his or her body was carefully treated and wrapped to preserve it as a mummy. According to ancient Egyptian belief, the pyramid, where the mummy was placed, provided a place for the king to pass into the afterlife.
There are many theories of how the pyramids were built but no body knows for sure the process ancient Egyptians followed to build the pyramids. One theory suggests that ramps were built to drag the blocks of building stones on sledges to the top. There are some evidence that this theory might be close to the truth as some parts of the mentioned ramps were found near building sites. These ramps were made of bricks and earth rubble and they were strong enough to carry the huge blocks used to build the pyramids.
Stones used in the construction process were quarried from remote or local quarries where they were either transported using wooden sleds as the wheel had not yet existed and even it had it wouldn't be of much use due to the heavy weight of the blocks.
Energy: Ability to do work Work= Force x Distance Force: A Push or a Pull Definitions:
Inclined Plane <ul><li>The Egyptians used simple machines to build the pyramids. One method was to build a very long incline out of dirt that rose upward to the top of the pyramid very gently. The blocks of stone were placed on large logs (another type of simple machine - the wheel and axle) and pushed slowly up the long, gentle inclined plane to the top of the pyramid. </li></ul>
Recording your results Angle of ramp Trial 1 Trial 2 Trial 3 Average force to pull Lifting straight up Dragging along the ground 45 degrees …… …… …… ……
Graphing and questions <ul><li>Which of your ramp took the least force to pull the block along? </li></ul><ul><li>Which ramp took the most force to pull the block up? </li></ul><ul><li>What is a disadvantage of a shallow ramp? </li></ul><ul><li>How does what you have learned today affect how you think the Egyptians built the pyramids? </li></ul>
Inclined Planes <ul><li>An inclined plane is a flat surface that is higher on one end </li></ul><ul><li>Inclined planes make the work of moving things easier </li></ul>
Inclined Plane - Mechanical Advantage <ul><li>The mechanical advantage of an inclined plane is equal to the length of the slope divided by the height of the inclined plane. </li></ul><ul><li>While the inclined plane produces a mechanical advantage, it does so by increasing the distance through which the force must move. </li></ul>
Screw The mechanical advantage of an screw can be calculated by dividing the circumference by the pitch of the screw. Pitch equals 1/ number of turns per inch.
Wedges <ul><li>Two inclined planes joined back to back. </li></ul><ul><li>Wedges are used to split things. </li></ul>