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# Gr. 8 Unit B

### Systems in Action Chapter 4

Mechanical System is a group of physical parts that interact with each other
Force is a push or pull that acts on an object
Contact Force must make contact/touch the object to push or pull
Friction is a force that opposes that relative motion of an object
Action-at-a-distance can push and pull an object without contact
Gravity is the attraction between 2 objects due to there mass the amount of attraction depend on each item's mass
Mass is the amount of matter in an object
Weight is the amount of force on an object due to gravity
Spring Scale shows the Weight of an object in Newtons
Work is the amount of effort spent where a force causes an object to move a distance
Energy is defined as the ability to work
Kinetic Energy when an object is moving, the energy it has is Kinetic Energy
Potential Energy any energy that is stored is Potential Energy
Gravitational Potential Energy the Potential Energy of an object that is able to fall is Gravitational Potential Energy
Machine is any mechanical system that reduces the force required to accomplish work
Input Force(Fin) the force that is applied to the machine
Output Force(Fout) the force that the machine applies to an object
Mechanical Advantages the amount by which a machine can multiply an Input Force
Ideal Mechanical Advantages the Mechanical Advantage of a machine that has no friction
Thermal Energy is Energy created by heat
When Work is Missing... Nxm=N/1 x m/1
When Force is Missing... N=Nxm/1 x 1/m
When Distance is Missing... m=Nxm/1 x 1/N
Created by: eforster0592