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Ch5 Vocabulary
Term | Definition |
---|---|
Work | When a force is applied to the object and the object moves in the same direction as the applied force. |
Power | The rate at which work is done. |
Machine | Device that makes doing work easier. |
Effort force | The force that is applied to the machine. |
Output force | The force applied by the machine. |
Mechanical advantage | The amount by which a machine multiplies the effort force. |
Efficiency | A measure of how much of the work put into a machine is changed into useful output work by the machine. |
Joules | Unit of work |
Newtons | Unit of force |
Watts | Unit of time |
Simple machine | A machine that does work with only one movement of the machine |
lever, pulley, wheel and axles, inclined plane, screw, and wedge | The 6 types of simple machines. |
lever | A bar that is free to pivot or turn around a fixed point. |
pulley | A grooved wheel with a rope, chain, or cable running along the groove. |
IMA | Mechanical advantage that does not include friction. |
Wheel and axle | A simple machine consisting of a shaft or axle attached to the center of a larger wheel, so that the wheel and axle rotate together. |
Gear | A wheel and axle with the wheel having teeth around its rim. |
Inclined plane | A sloping surface that reduces the amount of force required to do work. |
Screw | An inclined plane wrapped in a spiral around a cylindrical post. |
Wedge | An inclined plane with one or two sloping sides, that changes the direction of the input force. |
Compound machine | Two or more simple machines that operate together |