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S8P3
Simple Machines
Question | Answer |
---|---|
A ramp is an example of a simple machine called a | inclined plane |
When you raise or lower a flag on a flagpole, you are using a | wheel and axle |
A screw is actually a _________wrapped around a axle. | wheel |
Work is being done when | You apply a force to an object. |
The center of a seesaw is this part of a lever. | Fulcrum |
Which of the following is NOT a simple machine? | A. doorknob B. see-saw C. bullet D. shovel |
What is a Lever? | A bar that pivots on a fixed point called a fulcrum |
What is a first class lever? | A lever that changes the direction of the input force. |
What is a second class lever? | A lever that stays true to the input direction. |
What is a third class lever? | A lever whose force is between the fulcrum and the load. |
What is a pulley? | A simple machine that has a grooved wheel that holds a rope or a cable |
What is a Wheel and Axle? | A simple machine consisting of two circular objects of different sizes. |
What is a inclined plane? | A simple machine that is a straight, slanted surface. |
What is a wedge? | A pair of inclined planes that move. |
What is a Screw | A inclined plane that is wrapped in a spiral around a cylinder. |
What is a compound machine | A machine that has two or more simple machines. |
What is mechanical efficiency? | A comparison of work output with the work input |