Keywords Physical Science

speed

• the rate at which velocity changes over time; an object accelerates if its speed, direction,  or both change

• a force that opposes motion between two surfaces that are in contact 

• an object’s change in position relative to a reference point
  

• the distance traveled divided by the time interval during which the motion occurred
  

frame of reference

• the rate at which velocity changes over time; an object accelerates if its speed, direction,  or both change 

• a system for specifying the precise location of objects in space and time

• when a rounded object rolls over a flat surface

• the force that opposes the movement of two surfaces that are in contact and are  moving over each others

net force

• the force that resists the initiation of sliding motion between two surfaces that are in  contact and at rest 

• the distance traveled divided by the time interval during which the motion occurred

• the combination of all forces acting on an object 

• when a rounded object rolls over a flat surface

displacement

• when objects slide past each other 

• the change in position of an object always includes direction 

  
  

• the acceleration that occurs in circular motion  

  
  

• the force that resists the initiation of sliding motion between two surfaces that are in  contact and at rest 

Motion

• The change in position of an object always includes direction

• The speed of an object in a particular direction

• An object's change in position relative to a reference point

• When objects slide past each other

kinetic friction

• the force that opposes the movement of two surfaces that are in contact and are  moving over each others

•  system for specifying the precise location of objects in space and time

• a force that opposes motion between two surfaces that are in contact 

• the combination of all forces acting on an object

sliding friction

• when objects slide past each other 

• when a rounded object rolls over a flat surface

• the speed of an object in a particular direction 

• the combination of all forces acting on an object 

  
  

rolling friction

• a system for specifying the precise location of objects in space and time

• when objects slide past each other

• the rate at which velocity changes over time; an object accelerates if its speed, direction,  or both change 

• when a rounded object rolls over a flat surface

friction

• a force that opposes motion between two surfaces that are in contact 

• the force that opposes the movement of two surfaces that are in contact and are  moving over each others 

• the speed of an object in a particular direction 

• the combination of all forces acting on an object 

centripetal acceleration

• the combination of all forces acting on an object 

• the acceleration that occurs in circular motion

• when a rounded object rolls over a flat surface

• an object’s change in position relative to a reference point