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Science Uit 1-3
Term | Definition |
---|---|
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 Mechanical Advantage | N/A??? |
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 |