machines [7] [levers] [1] [comprehension quiz]

A first-class lever is where the fulcrum is between the effort and the load. Effort: The force applied to move the load. Fulcrum: The fixed point around which the lever pivots. Load: The weight or resistance being moved. A pair of pliers are an example of a first class lever. A rowing boat is an example of a first class lever. The crow bar is an example of a first class lever. The pair of scissors are an example of a first class lever. The seesaw is an example of a first class lever. The light switch is an example of a first class lever. The seige catapult is an example of a first class lever.

Which of these diagrams shows a first class lever ? 1                       2                       3 Which of these diagrams is NOT a first class lever ? 1                       2                       3 Which of these combinations is a first class lever ? Fulcrum Effort Load                        Effort Load Fulcrum                        Effort Fulcrum Load

There are 9 pictures in a grid. As you hover over each picture a blue screen appears on which there is some information about what is being shown in the picture. Read this information and look at each picture to make sure you understand. If you want to check how much you understand try the quiz on the right hand side. Hover over the pictures to magnify them to make them easier to see. To start the activity again just refresh the page.