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Vocab unit 4


Speed Movement from place to another over time ; distance divided by time
Average Time it takes to travel the whole distance
Instatntateus speed Speed at an instant of time
Velocity Speed of an object and it's direction of motion
Acceleration Change in velocity divided by the amount of time needed for the change to occur
Force A push or a pull
Newton's first law Object at rest or in motion remains unless acted upon by another force
Newton's second law The speed of an object (acceleration is directly proportional to the force acting on it
Newton's third law When a force is exerted on an object , the object exerts an equal and opposite force on the first
Friction Force that racist motion between two touching surfaces and always acts opposite to the direction of motion
Inertia Tendency to resist in motion
Mass The amount of matter in an object
Work Applied forces causing an object to move in the direction of the force
Machine A device with moving parts that works together to accomplish a task
Pulley A object like a grooved wheel with a rope running thru the groove bad changes the direction of the input force
Lever A stiff structure that rotates around a fixed point called fulcrum
Inclined plains A sloped surface
Wedge Moving of an inclined plane
Screw The threads of screw are one long , continuos inclined plane ( wedge) and changes the direction of force
Simple machine Uses only one movement
Compound machine A combination of simple machines
Mechanical advantages The ratio of an output to input force
Created by: kvvega