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# Science Uit 1-3

TermDefinition
Reference Point a place or object used for comparison to determine if something is in motion
Frame of Reference is a set of coordinates that can be used to determine positions and velocities of objects in that frame; different frames of reference move relative to one another.
Displacement the direct, change in position of an object
Speed the distance an object travels per unit of time
Velocity The speed and direction of an object!
Momentum Product of an object’s mass and velocity
Acceleration the rate of change of velocity
Force a push or pull on something anything that changes something’s acceleration.
Friction anything that changes something’s acceleration.
Weight The gravitational force exerted on an object is the object’s weight
Newtons First Law An object moves at a constant velocity unless an unbalanced force acts upon it.
Newtons Second Law The motion of an object changes only if an unbalanced force acts on the object
Newtons Third Law When one object exerts a force on a second object, the second object exerts a force on the first that is equal in strength and opposite in direction.
Work force applied through a distance
Efficiency the ratio of output to input work. It is measured as a percent
Mechanical Advantage the ratio of output force to input force The effectiveness of a machine
Energy The ability to cause change! limits what can happen in any system
Power rate at which energy is converted
Unit of Distance Meters
Unit of Time Seconds
Unit of Speed meters/second
Unit of Momentum kg*m/s
Unit of Acceleration Meters/Second Squared
Unit of Weight Fg
Unit of Force Newtons
Unit of Work Joules
Unit of KE/PE Joules
Unit of Efficiency Percent
Unit of Power Watts
Unit of Calories Joules 4000=1J
Unit of Mass kg
Equation for Displacement Direction+Direction, Direction-Direction, Pythagorean theorem
Equation for Speed Distance * Time
Equation for Momentum p=mv
Equation for Force F=ma
Equation for Weight W=mg
Equation for Work W=Fd
Equation for Power W p=----- t
Created by: kcross26

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