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22 terms

Science Chapter 4: Work and Machines

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Work
Force exerted on an object that causes it to move
Wedge
An inclined plane that moves
Wheel and axle
2 circular or cylindrical objects that are fastened together and rotate about a common axis
Screw
An inclined plane wrapped around a central cylinder to form a spiral
Pulley
A grooved wheel around which is wrapped a rope, chain, or cable
Machine
A device that changes the amount of force exerted or the direction in which force is exerted
Lever
A rigid object that pivots about a fixed point
Output force
The force exerted on an object by a machine
Inclined plane
A flat surface with one end higher than the other
Joule
A unit of work to one newton-meter
Input force
The force exerted on a machine
MA
The number of times the force exerted on a machine is multiplied by the machine
Efficiency
The percentage of the input work that is converted to output work
Wedge
Axe
Screw
Screw
Wheel and axle
Bike wheel
Inclined Plane
Ramp
Pulley
Ropes on a flag pole
Lever
See-saw
Compound machine
A device that contains 2 or more simple machines
body machines
Neck = Lever, Teeth = Wedges
machine
Changes the amount of force exerted, the distance over which the force is exerted, and the direction in which the force is exerted

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