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Chapter 5 Flashcards
Question | Answer |
---|---|
What is motion? | an object's change in position relative to a reference point |
What is speed? | the distance traveled divided by the time interval during which the motion occurred |
What is velocity? | the speed of an object in a particular direction |
What is acceleration? | the rate at which velocity changes over time; an object accelerates if its speed, direction, or both change |
What is a force? | a push or pull |
How do scientists express force? | in units called Newtons (N) |
What is net force? | the combination of all of the forces acting on an object |
What is friction? | a force that opposes motion between 2 surfaces that are in contact |
What are the 2 types of friction? | kinetic friction and static friction |
What is gravity? | a force of attraction between objects that is due to their masses |
What is weight? | a measure of the gravitational force exerted on an object; its value can change with the location of the object in the universe |
What is mass? | a measure of the amount of matter in an object |