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PS Ch 4 Vocab 2016

Section 1 & 2

QuestionAnswer
Energy an moving object has because of its motion; depends on the mass and speed of the object. Kinetic Energy
SI unit of energy Joule
Stored energy an object has due to its position. Potential Energy
Energy stored when an object is compressed or stretched. Elastic Potential Energy
Energy stored in chemical bonds. Chemical Potential Energy
Energy stored by objects due to their position above Earth's surface and the object's mass. Gravitational Potential Energy
Sum of the potential energy and kinetic energy in a system. Mechanical Energy
States that energy can never be created or destroyed. Law of Conservation of Energy
Machine A device that makes doing work easier
Input Force The force that is applied to the machine.
Output Force The force applied by the machine.
Mechanical Advantage The ratio of the output force to the input force.
efficiency A measure of how much of the work put into machine is changed into useful output work by the machine.
Simple Machine Machine that does work with only one movement-lever, pulley, wheel and axle, inclined plane, and wedge.
Lever Simple machine consisting of a bar free to pivot about a fixed point called the fulcrum.
Pulley Simple machine that consists of a grooved wheel with a rope, chain, or cable running along the groove; can be wither fixed or movable.
Wheel and axle Simple machine that consists of a shaft or axle attached to the center of a larger wheel, so that the shaft and the wheel rotate together.
Inclined Plane Simple machine that consists of a sloping surface, such as a ramp, that reduces the amount of force needed to lift something by increasing the distance over which the force is applied.
Screw Simple machine that consists of an inclined plane wrapped in a spiral around a cylindrical post.
Wedge Simple machine that is an inclined plane with one or two sloping sides.
Compound Machine Machine that is a combination of two or mare simple machines.
work transfer of energy that occurs when a force makes an object move;measured in joules
power amount of work done, or the amount of energy transferred, divided by the time required to do the work or transfer the energy; measured in watts.
Created by: allimarie_11
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