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Middle School Physical Science: Work and Machines - Simple Machines
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Avg score: 62% Most missed: “Which of the following is an example of a third class lever?”
A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that use mechanical advantage to multiply force. An inclined plane is a simple machine consisting of a sloping surface that connects lower and higher elevations. An inclined plane makes it easier to move objects uphill against the force of gravity. The sloping surface of the inclined plane supports part of the weight of the object as it moves up the slope. As a result, it takes less force to move the object to a higher elevation. The trade-off... Show more
Middle School Physical Science: Work and Machines - Simple Machines
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6 Questions

1. Which of the following is an example of a screw?
2. Which type of simple machine is a chisel?
3. The ideal mechanical advantage of a screw is always
4. Which of the following is an example of a third class lever?
5. A wheel and axle increase the applied force when
6. Which class of lever does not change the direction of the applied force?