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# Motion and Machines

### Unit 4 - Force and Motion / Work & Machines

TermDefinition
balanced force forces on an object that are equal in size and opposite in direction
effort distance distance over which the effort is applied
effort force the force applied to the machine
force a push or pull that changes motion
gravity an attractive force between any objects that depends on the masses of the objects and the distance between them
inertia the tendency of an object to resist any change in its motion
machine a device that makes work easier
net force the sum of forces acting on an object
Newton’s 1st law states that an object moving at constant velocity keeps moving at that velocity unless an unbalanced force acts on it
Newton’s 2nd law states that the acceleration of an object is in the same direction as the net force on the object and can be calculated by F=ma
Newton’s 3rd law states that when one object exerts a force on a second object, the second one exets a force on the first that is equal in strength and opposite in direction
resistance distance the distance required by the machine to move the object
resistance force the force applied by the machine
weight the gravitational force exerted on an object
work a force applied over a distance that causes a change in motion
mechanical advantage ratio of the output force exerted by the machine to the input force applied to the machine
Created by: vfenstermaker