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# 7th grade Wrk & Mach

### Fletcher 7th grade Work and Machines Review

TermDefinition
Gravity A force exerted by all matter
Joule The unit for measuring work and equal to 1 Nm
Geotropism Growth in response to Earth's gravity
Screw An inclined plane wrapped around a central bar
Mechanical Advantage When effort force is multiplied (increased) by using a machine
Pulley A rope belt or chain wrapped around a grooved wheel
Heat A form of energy created by heat
Inertia A property of matter that tends to resist changing motion
Equilibrium When all the forces acting on an object are in balance
Turgor Pressure A force that causes plants to stand up straight
Newton The unit for measuring Force and equal to 1Kg m/sec/sec
Phototropism Growth in response to light
Negative Geotropism Growth in a direction opposite to the pull of gravity
Distance Work = Force x ________
Acceleration A change in motion
Inclined plane Scientific name for a ramp
Fulcrum The pivot point of a lever
Friction A force that opposes motion
Pitch The distance between two threads on a screw
Wedge A double inclined plane
Created by: coach_fletcher